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【单选题】
同一弹簧振子按图的三种方法放置,它们的振动周期分别为Ta, Tb, Tc (摩擦力忽略),则三者之间的关系为
A.
Ta= Tb =Tc
B.
Ta= Tb >Tc
C.
Ta> Tb >Tc
D.
Ta< Tb
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