已知菱形ABCD的周長(zhǎng)是16 ∠A=60° 則對(duì)角線BD的

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    問(wèn)題補(bǔ)充:?jiǎn)芜x題 已知菱形ABCD的周長(zhǎng)是16,∠A=60°,則對(duì)角線BD的長(zhǎng)度為?
    A.2
    B.2
    C.4
    D.4
    答案:C