如图,在Rt△ABC中,∠ACB=90°,∠A=30°,CD⊥AB于点D.则△BCD与△ABC的

如图,在Rt△ABC中,∠ACB=90°,∠A=30°,CD⊥AB于点D.则△BCD与△ABC的周长之比为(     )

A.1︰2           B.1︰3          C.1︰4           D.1︰5

答案

A解析:

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