单项选择题
A.λ/2 B.λ/4 C.3λ/4 D.λ
A.2V0 B.1/2V0 C.V0 D.3/2V0
A.0.02cm,0.5cm B.-0.02m,-0.5m C.-0.02m,0.5m D.0.02m,0.5m
A.动能为零,势能最大 B.动能为零,势能为零 C.动能最大,势能最大 D.动能最大,势能为零
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