進(jìn)出口貨物名稱中英對(duì)照 (95)

字號(hào):

dicyclic ring 雙環(huán)核
    dicyclohexyl peroxydicarbonate 過氧化二碳酸二環(huán)已酯
    dicyclohexyl phthalate 鄰苯二甲酸二環(huán)已酯
    dicyclohexyl 雙環(huán)己基
    dicyclohexylamene 二環(huán)己基胺
    dicyclohexylamine nitrite 二環(huán)己胺亞硝酸鹽
    dicyclopentadiene 二聚環(huán)戊二烯
    dicycloverine 雙環(huán)維林
    dicynone 止血敏
    didecylamine 二癸胺
    Didigam S 西丹合劑
    Didigam 滴丹混劑
    didodecyldithio-oxamide 雙十二烷基二硫代乙二酰二胺
    didrovaltrate 地戊曲酯
    die and profile shaping machine 刨模機(jī)
    die assembly 模具
    die cast mould 壓鑄模
    die centre 模子定心盤
    die chaser 螺紋梳刀
    die chuck 螺絲鋼板夾頭
    die clicker 沖壓裁剪機(jī)
    die cutter 沖壓裁剪機(jī)
    die equipment 模具
    die for English standard thread 英制螺紋板牙
    die for metric fine thread 公制細(xì)螺紋板牙
    die for pipe thread 管螺紋板牙
    die for taper thread 錐螺紋板牙
    die forging machine 模鍛機(jī)
    die handle 螺紋板牙扳手
    die head rivet 沖墊鉚釘
    die hob 標(biāo)準(zhǔn)絲錐
    die mill 模具銑刀
    die milling machine 鋼模刻紋機(jī)
    die nut 六角形板牙
    die of stamp 搗礦砧
    die preheating furnace 模具預(yù)熱爐
    die processing unit 模具加工機(jī)
    die rolling mill 周期斷面型材軋機(jī)
    die set 模具
    die sinker 刻模機(jī)
    die sinkers' needle file 異形銼刀
    die sinking EDM machine 電火花刻模機(jī)
    die stamping press 壓凸印刷機(jī)
    die steel for plastic industry 塑料工業(yè)用模具鋼
    die steel 模具鋼
    die tool grinding machine 模具工具磨床
    die-casting aluminium 壓鑄鋁合金
    die-casting machine for motor rotor 電機(jī)轉(zhuǎn)子壓鑄機(jī)
    die-casting machine with submerged gooseneck 浸沒式鵝頸管壓鑄機(jī)
    die-casting machine 壓鑄機(jī)
    die-casting mould 壓鑄模
    die-cutting machine 沖壓裁剪機(jī)
    die-sinking machine 刻鍛模機(jī)
    die-slotting machine 沖模插床
    die-stamping ink 浮凸油墨
    die-stamping machine 鋼模壓印機(jī)
    dieing machine 高速精密沖床
    dieing out press 沖床
    dieldrin 狄氏劑
    dielectric amplifier 介質(zhì)放大器
    dielectric bolometer 介質(zhì)輻射熱計(jì)
    dielectric cable 介質(zhì)電纜
    dielectric constant detector 介電常數(shù)檢測儀
    dielectric diode 電介質(zhì)二極管
    dielectric dot frequency oscillator 介質(zhì)點(diǎn)頻振蕩器
    dielectric drier 介電干燥機(jī)
    dielectric heater 介電加熱器
    dielectric lens 介質(zhì)透鏡
    dielectric loss measuring set 介質(zhì)損耗測量裝置
    dielectric materials for microwave resonator 微波諧振器介質(zhì)材料
    dielectric oil 絕緣油
    dielectric paper 絕緣紙
    dielectric plate 絕緣板
    dielectric radiator 介質(zhì)幅射器
    dielectric self-oscillation mixer 介質(zhì)自振混頻器
    dielectric separator 介電分離器
    dielectric strength tester 耐壓測試器
    dielectric test set 高頻絕緣試驗(yàn)器
    dielectric track detector 電介質(zhì)徑跡探測器
    dielectric type hygrometer 介電濕度計(jì)
    dielectric type moisture meter 電介質(zhì)濕度計(jì)
    dielectric vapor detector 介電蒸氣檢測器
    dielectric waveguide 介質(zhì)波導(dǎo)管
    dielectrometer 介質(zhì)測試器
    Dien 迪恩聚丁二烯纖維
    diene rubber 二烯橡膠
    diene 二烯
    dienestrol 己二烯雌酚
    dienol 二烯醇
    dienone 二烯酮
    dienophile 親二烯物
    Dieppe lace 迪埃普梭結(jié)針繡花邊
    Diescher elongator 迪舍爾軋管機(jī)
    Diescher mill 迪舍爾軋機(jī)
    diesel alternator 柴油發(fā)電機(jī)
    diesel car 柴油汽車
    diesel concrete mixer 柴油混凝土攪拌機(jī)
    diesel cycle engine 柴油循環(huán)發(fā)動(dòng)機(jī)
    diesel cylinder oil 柴油機(jī)汽缸油
    diesel dope 柴油添加劑
    diesel dumper 機(jī)動(dòng)翻斗車
    diesel dynamo aggregate 柴油機(jī)直流發(fā)電機(jī)組
    diesel engine driven centrifugal pump 柴油機(jī)驅(qū)動(dòng)離心泵
    diesel engine driven DC arc welding machine 柴油機(jī)驅(qū)動(dòng)直流弧焊機(jī)
    diesel engine driven hammer 柴油機(jī)驅(qū)動(dòng)錘
    diesel engine driven mixed-flow pump 混流式柴油機(jī)泵
    diesel engine driven self-priming pump 柴油機(jī)自吸泵
    diesel engine dynamometer 柴油機(jī)測力計(jì)
    diesel engine electric remotecontrol unit 柴油電動(dòng)搖控裝置
    diesel engine exhaust pyrometer 柴油機(jī)排氣高溫計(jì)
    diesel engine for automobile 車用柴油機(jī)
    diesel engine fuel delivery advance angle testing instrument 柴油機(jī)供油提前角檢測儀
    diesel engine fuel oil 柴油機(jī)燃油
    diesel engine generating set 柴油機(jī)發(fā)電機(jī)組
    diesel engine generator 柴油發(fā)電機(jī)
    diesel engine of fishing vessel 漁船柴油機(jī)
    diesel engine oil additive 柴油機(jī)油添加劑
    diesel engine oil 柴油機(jī)油
    diesel engine over-speed relay 柴油機(jī)超速繼電器
    diesel engine 柴油機(jī)
    diesel fork truck 內(nèi)燃叉車
    diesel fuel oil 柴油
    diesel fuel 柴油
    diesel generating set 柴油發(fā)電機(jī)組
    diesel generator set 柴油發(fā)電機(jī)組
    diesel generator 柴油發(fā)電機(jī)
    diesel high compression engine 高壓柴油機(jī)
    diesel hydraulic locomotive 內(nèi)燃液力傳動(dòng)機(jī)車
    diesel hydraulic railway crane 內(nèi)燃液力鐵路起重機(jī)
    diesel injector 柴油機(jī)噴油器
    diesel locomotive 柴油機(jī)車
    diesel lubricating oil 柴油機(jī)潤滑油
    diesel motor roller 柴油壓路機(jī)
    diesel oil pump 柴油泵
    diesel oil purifier 柴油凈化器
    diesel oil separator 柴油分離器
    diesel oil transfer pump 柴油輸送泵
    diesel oil 柴油
    diesel pile driver 柴油打樁機(jī)
    diesel pile hammer with crawler carrier 履帶式柴油打樁機(jī)
    diesel pile hammer 內(nèi)燃機(jī)打樁錘
    diesel pile-driving engine 柴油機(jī)打樁機(jī)
    diesel power generating set 柴油發(fā)電機(jī)組
    diesel railcar 內(nèi)燃機(jī)軌道車
    diesel rig 柴油鉆機(jī)
    diesel rock drill 內(nèi)燃鑿巖機(jī)
    diesel self-sprinkling pump set 柴油自噴泵組
    diesel ship 柴油機(jī)船
    diesel smokometer 柴油機(jī)煙濃度計(jì)
    diesel starting fuel 柴油機(jī)起動(dòng)燃料
    diesel tractor 柴油拖拉機(jī)
    diesel truck 柴油運(yùn)貨車
    diesel vehicle 柴油車
    diesel-compressor aggregate 柴油壓縮機(jī)組
    diesel-driven DC welder 柴油驅(qū)動(dòng)直流焊機(jī)
    diesel-driven generator 柴油驅(qū)動(dòng)發(fā)電機(jī)
    diesel-driven pump 柴油機(jī)驅(qū)動(dòng)泵
    diesel-driven single centrifugal pump 柴油機(jī)驅(qū)動(dòng)離心泵
    diesel-driven single stage centriufugal pump 柴油機(jī)驅(qū)動(dòng)單級(jí)離心泵
    diesel-electric locomotive 柴油電動(dòng)機(jī)車
    diesel-electric mobile power shovel 柴油電力移動(dòng)式電鏟
    diesel-electric power unit 柴油電力機(jī)組
    diesel-electric railcar 柴油電動(dòng)軌道車
    diester oil 合成雙酯潤滑油
    diester 二元酸酯
    diestock 螺紋板牙扳手
    diet Pepsi 無糖百事可樂
    dietary alkali 食用堿
    diethadione 地沙雙酮
    diethanolamine 二乙醇胺
    diethazine 雙乙嗪
    diethoxy-4-nitrochlorobenzene 二乙氧基-4-對(duì)甲苯巰基硝基苯
    diethoxymethane 二乙氧基甲烷
    diethquinalphione 喹惡磷
    diethyl adipate 己二酸二乙酯
    diethyl butylmalonate 正丁基丙二酸二乙酯
    diethyl carbonate 碳酸二乙酯
    diethyl ethylene diamine 二乙基乙醇胺
    diethyl fumarate 反丁烯二酸二乙酯
    diethyl glutarate 戊二酸二乙酯
    diethyl maleate 順丁烯二酸二乙酯
    diethyl malonate 丙二酸二乙酯
    diethyl oxalate 草酸二乙酯
    diethyl p-nitrophenyl phosphate 對(duì)硝基苯磷酸二乙酯
    diethyl phosphate 磷酸二乙酯
    diethyl phosphite 亞磷酸二乙酯
    diethyl phthaltate 鄰苯二甲酸二乙酯
    diethyl sebacate 癸二酸二乙酯
    diethyl succinate 琥珀酸二乙酯
    diethyl sulphate 硫酸二乙酯
    diethyl tartrate 酒石酸二乙酯
    diethyl 二乙基
    diethyl-m-toluidine 二乙基間甲苯胺
    diethyl-o-toluidine 二乙基鄰甲苯胺
    diethyl-p-phenylenediamine sulfate 二乙基對(duì)苯二胺硫酸鹽
    diethyl-p-tlouidine 二乙基對(duì)甲苯胺
    diethylacetic acid 二乙基乙酸
    diethylallylacetamide 二乙烯丙醋胺
    diethylamine hydrochloride 二乙胺鹽酸鹽
    diethylamine phosphate 二乙胺磷酸鹽
    diethylamine salicylate 二乙胺水楊酸鹽
    diethylamine solution 二乙胺溶液
    diethylamine 二乙胺
    diethylammonium diethyldithiocarbamate 二乙基二硫代氨基甲酸二乙銨
    diethylaniline hydrochloride 二乙苯胺鹽酸鹽
    diethylaniline 二乙苯胺
    diethylbenzene 二乙基苯
    diethylcapramide 二乙基癸酰胺
    diethylcarbamazine citrate 海群生
    diethylcarbamazine 乙胺嗪
    diethylchloroacetamide 二乙基氯乙酰胺
    diethylene glycol diethyl ether 二乙二醇二乙醚
    diethylene glycol dilaurate 二乙二醇雙酯
    diethylene glycol dimethyl ether 二乙二醇二甲醚
    diethylene glycol monoacrylate 二乙二醇單丙烯酸酯
    diethylene glycol monobutyl ether 二乙醇單丁醚
    diethylene glycol monoethyl ether 二乙二醇單乙醚
    diethylene glycol 二乙二醇
    diethylene 二次乙基
    diethylenetriamine pentaacetic acid pentasodium salt 二乙三胺五乙酸五鈉
    diethylenetriamine pentaacetic acid 二乙三胺五乙酸
    diethylenetriamine pentamethylene phosphoric acid 二乙三胺五亞甲基磷酸
    diethylenetriamine 二乙撐三胺
    diethylester 二乙酯
    diethylether 二乙醚
    diethylformamide 二乙基二酰胺
    diethylpropanediol 二乙丙二醇
    diethylstilbestrol 己烯雌酚
    diethylthiambutene 二乙噻丁
    diethyltoluamide 二乙甲苯酰胺
    diethystilbestrolum 己烯雌酚
    Difar 代森鋅殺菌劑
    difebarbamate 苯巴氨酯
    difemerine 雙苯美林
    difemetorex 苯托雷司
    difenamizole 雙苯米唑
    difenidol 地芬尼多
    difenoxin 地芬諾新
    difenoxuron 枯莠隆
    difenpiramide 聯(lián)苯吡胺
    difenzoquat 野燕枯
    difetarsone 雙苯他胂
    diff-temperature transmitter 溫差傳送器
    difference amplifier 差分放大器
    difference detector 差分檢波器
    difference diode 差分二極管
    difference gauge 極限量規(guī)
    difference pressure flow meter 差壓式流量計(jì)
    difference pressure piping for flowmeter 流量計(jì)用差壓管
    difference type relay 差動(dòng)繼電器
    differential absorption dye laser radar 差動(dòng)吸收染料激光雷達(dá)
    differential air thermometer 差示空氣溫度計(jì)
    differential ammeter 差動(dòng)安培表
    differential amplifier multiplier 差分放大乘法器
    differential amplifier 微分放大器
    differential analyser 微分分析機(jī)
    differential axle 半軸
    differential bevel gear 差動(dòng)傘齒輪
    differential block 差動(dòng)滑車
    differential booster 差動(dòng)升壓機(jī)
    differential brake 差動(dòng)制動(dòng)器
    differential busbar ring 差動(dòng)式匯流環(huán)
    differential capacitance acceleration transducer 差容式加速度傳感器
    differential capacitor 微分電容器
    differential capstan 差動(dòng)絞盤
    differential carrier 差速器殼
    differential case 差速器箱
    differential chain hoist 差動(dòng)鏈?zhǔn)狡鹬貦C(jī)
    differential column 微分塔
    differential comparator amplifier 差分比較放大器
    differential compound generator 差復(fù)勵(lì)發(fā)電機(jī)
    differential compound motor 差復(fù)勵(lì)電動(dòng)機(jī)
    differential compound winding 差復(fù)勵(lì)繞組
    differential computing potentiometer 微分計(jì)算電位計(jì)
    differential condenser 差動(dòng)電容器
    differential conductivity recorder 差熱導(dǎo)記錄儀
    differential contact-type air plug 差動(dòng)接觸式氣動(dòng)塞規(guī)
    differential controller 差動(dòng)控制器
    differential counter 差動(dòng)計(jì)數(shù)器
    differential cylinder 差動(dòng)汽缸
    differential diagnosis instrument 鑒別診斷儀
    differential discriminator 差動(dòng)式鑒頻器
    differential draft gauge 壓差計(jì)
    differential drive gear 差速器傳動(dòng)齒輪
    differential drive tachometer 差動(dòng)傳動(dòng)式轉(zhuǎn)速表
    differential dynamometer 差動(dòng)側(cè)力計(jì)
    differential electrometer 差動(dòng)靜電計(jì)
    differential equation solver 微分方程解算器
    differential excited generator 差勵(lì)發(fā)電機(jī)
    differential filter 差動(dòng)濾波器
    differential flowmeter for steam 蒸汽差壓流量計(jì)
    differential flowmeter in gas service 氣體差壓流量計(jì)
    differential flowmeter in liquid service 液體差壓流量計(jì)
    differential flowmeter 差示流量計(jì)
    differential fluid amplifier 微分射流放大器
    differential four-channel gamma-ray spectrometer 差動(dòng)四通道伽瑪射線能譜儀
    differential galvanometer 差動(dòng)檢流計(jì)
    differential gauge 差壓計(jì)
    differential gear slipmeter 差動(dòng)齒輪轉(zhuǎn)差計(jì)
    differential gear 差速齒輪
    differential generator 差動(dòng)振蕩器
    differential governor 差動(dòng)調(diào)節(jié)器
    differential hoist 差動(dòng)復(fù)滑車
    differential instrument 差動(dòng)儀表
    differential iron tester 差動(dòng)鐵質(zhì)測試器
    differential jack 差動(dòng)起重器
    differential leak detector 差動(dòng)檢漏器
    differential light scattering analyzer 差示光散射分析儀
    differential liquid level gauge 差式液位計(jì)
    differential manometer 差示壓力計(jì)
    differential measuring instrument 差動(dòng)式測量儀表
    differential megnetometer 差動(dòng)磁強(qiáng)計(jì)
    differential meter 差動(dòng)儀
    differential micrometer 差示測微計(jì)
    differential microphone 差動(dòng)式傳聲器
    differential monitor 差動(dòng)監(jiān)控器
    differential motor 微分電動(dòng)機(jī)
    differential nuclear magnetic resonance magnetometer 差動(dòng)式核磁共振磁強(qiáng)計(jì)
    differential phase measuring set 微分相位測量器
    differential phase shifter 微分移相器
    differential photoelectronic spectrometer 差動(dòng)光電子譜儀
    differential photoelectrooptical refractometer 差動(dòng)電光學(xué)折射計(jì)
    differential piston compressor 差動(dòng)活塞壓縮機(jī)
    differential piston pump 差動(dòng)活塞泵
    differential planet gear 差動(dòng)行星齒輪
    differential plunger pump 差動(dòng)柱塞泵
    differential pressure amplifier 差壓放大器
    differential pressure cell 差壓傳感器
    differential pressure controller 差壓控制器
    differential pressure flowmeter 差壓流量計(jì)
    differential pressure gauge 差壓計(jì)
    differential pressure indicator 差壓指示器
    differential pressure level controller 差壓式液位控制器
    differential pressure meter 差壓計(jì)
    differential pressure pickup 差壓傳感器
    differential pressure recorder controlller 差壓記錄控制器
    differential pressure recorder 差壓記錄儀
    differential pressure regulator 差壓調(diào)節(jié)器
    differential pressure switch 差壓開關(guān)
    differential pressure transducer 差壓變換器
    differential pressure transmitter 差壓變送器
    differential pressure type flowmeter 差壓式流量計(jì)
    differential pressure type level detector 差壓式液位檢測器
    differential pressure type level gauge 差壓式液位計(jì)
    differential pressure type liquid level controller 差壓式液位控制器
    differential protection relay 差動(dòng)保護(hù)繼電器
    differential pulley 差動(dòng)滑輪
    differential pump 差動(dòng)泵
    differential purchase 差動(dòng)復(fù)滑車
    differential reactor 差式反應(yīng)器
    differential reduction gear 差動(dòng)式減速齒輪器
    differential refraction detector 差示折射檢測器
    differential refractive index detector 差示析光率檢測器
    differential refractometer detector 差示折光計(jì)檢測器
    differential refractometer 差示折光計(jì)
    differential regulating trasformer 差接可調(diào)變壓器
    differential regulator 差動(dòng)調(diào)節(jié)器
    differential relay 差動(dòng)繼電器
    differential roll 差壓輥
    differential scanning calorimeter 微分掃描熱量計(jì)
    differential scanning colourimeter 微分掃描比色計(jì)
    differential screen 微分篩
    differential selsyn motor 差動(dòng)自動(dòng)同步電機(jī)
    differential selsyn 差動(dòng)自動(dòng)同步機(jī)
    differential series winding 差接串勵(lì)繞組
    differential side gear 差速器側(cè)齒輪
    differential sliding valve 差動(dòng)滑閥
    differential spider 差速器十字軸
    differential supercharger 差動(dòng)增壓器
    differential surface reflectometer 微分表面反射計(jì)
    differential synchronizer 差動(dòng)同步機(jī)
    differential tackles 差動(dòng)滑車組
    differential thermal analyzer 差熱分析儀
    differential thermal solarimeter 差熱日射計(jì)
    differential thermometer 差示溫度計(jì)
    differential transformer 差接變壓器
    differential transmitter 差動(dòng)式變送器
    differential trap 差熱式阻汽器
    differential twin-flowmeter 雙管壓差流量計(jì)
    differential type galvanometer 差動(dòng)式檢流計(jì)
    differential type relay 差動(dòng)式繼電器
    differential U tube 差示U形管
    differential ultrasonic velocimeter 差示超聲測速儀
    differential valve 差動(dòng)閥
    differential vapour pressure thermometer 差示蒸汽壓力溫度計(jì)
    differential voltmeter 差動(dòng)式伏特計(jì)
    differential wave velocity analyser 微分波速分析儀
    differential 差速器
    differentiating amplifier 差動(dòng)放大器
    differentiator amplifier 微分放大器
    differentiator cathode follower 微分陰極輸出器
    differentiator comparator 微分比較器
    differentiator selector 微分選擇器
    differentiator 微分器
    diffracting crystal spectrometer 衍射晶體光譜儀
    diffraction camera 衍射照相機(jī)
    diffraction gauge 衍射應(yīng)變儀
    diffraction grating interferometer 衍射光柵干涉儀
    diffraction grating spectrograph 衍射光柵攝譜儀
    diffraction grating spectrometer 衍射光柵光譜儀
    diffraction lens 衍射透鏡
    diffraction meter 衍射計(jì)
    diffraction micrometer 衍射測微器
    diffraction microscope 衍射顯微鏡
    diffraction spectrograph 衍射攝譜儀
    diffraction spectrometer 衍射光譜計(jì)
    diffraction spectroscope 衍射分光鏡
    diffraction velocimeter 衍射測速儀
    diffractometer 衍射計(jì)
    diffusant 擴(kuò)散劑
    diffuse reflection glass 漫反射玻璃
    diffused base transistor 擴(kuò)散基極晶體管
    diffused component 擴(kuò)散元件
    diffused EC transistor 擴(kuò)散發(fā)射極集電極晶體管
    diffused junction detector 擴(kuò)散結(jié)檢測器
    diffused junction transistor 擴(kuò)散結(jié)晶體管
    diffused silicon diode 擴(kuò)散型硅二極管
    diffused type diode 擴(kuò)散型二極管
    diffuser centrifugal pump 擴(kuò)散式離心泵
    diffuser pump 擴(kuò)散泵
    diffuser type centrifugal pump 擴(kuò)散形離心泵
    diffuser valve 擴(kuò)散閥
    diffuser vane 擴(kuò)壓器葉片
    diffuser 擴(kuò)散器
    diffusing filter 擴(kuò)散濾波器
    diffusing glass 漫射玻璃
    diffusing globe 漫射器
    diffusing type steam valve 擴(kuò)散式汽閥
    diffusiometer 滲漏器
    diffusion absorption refrigerator 擴(kuò)散吸收式冰箱
    diffusion base plane transistor 擴(kuò)散基極平面晶體管
    diffusion disk 漫射鏡
    diffusion pump grease 擴(kuò)散泵潤滑脂
    diffusion pump 擴(kuò)散泵
    diffusion transistor 擴(kuò)散晶體管
    diffusion vacuum pump 擴(kuò)散真空泵
    diffusion-type chemical laser 擴(kuò)散型化學(xué)激光器
    diflorasone 雙氟拉松
    diflubenzuron 除蟲脲
    diflucortolone 雙氟米松
    diflunisal 雙氟尼酸
    difluoro-benzene 二氟代苯
    difluorobromomethane 二氟一溴甲烷
    difluorochlobromomethane 二氟一氯一溴甲烷
    difluorodibromomethane 二氟二溴甲烷
    difluprednate 雙氟潑尼酯
    difmedol 地夫美多
    Difolotan 敵菌丹
    diformin tablet 二甲雙胍片
    Diftoran 氟鼠烷
    difurfuryl disulbide 二糠基二硫
    digallic acid 丹寧
    digestant 消化劑
    digester 蒸煮鍋
    digestion pill of betel nut 檳榔四消丸
    digestion powder for infants 小兒消食散
    digestion-promoting pill 開胸順氣丸
    digestiva 助消化藥
    digestive and stomachic 健胃消化藥
    digestor 蒸煮器
    digger dredger 采掘式挖泥船
    digger plough 犁式挖溝機(jī)
    digger 挖掘機(jī)
    digging arm loader 立抓裝碴機(jī)
    digging machine 挖掘機(jī)
    digging shovel 挖掘鏟
    digging spoon 挖掘勺
    digimatic caliper 電子數(shù)顯卡尺
    digimatic depth gage 電子數(shù)顯深度尺
    digimatic height gage 電子數(shù)顯高度尺
    Digiset 電子照相排字機(jī)
    digit absorber 消位器
    digit counter 數(shù)字計(jì)數(shù)器