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题目： 单选题（2011）图示装置中，已知质量m=200kg，弹簧刚度k=100N/cm，则图中各装置的振动周期为：（）
A图A.装置振动周期最大
B图B.装置振动周期最大
C图C.装置振动周期最大
D三种装置振动周期相等
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