皮皮学，免费搜题
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【单选题】
听力原文：M: Hi, Susan, I hear that you walk all the way to the office these days. W: Yes, I found great pleasure in walking. That's the type of exercise I enjoy very much. Why does Susan walk all the way to the office?A.
She takes it as a kind of exercise.
B.
She wants to save money.
C.
She loves doing anything that is new.
D.
Her office isn't very far.
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【简答题】一质点作简谐振动，周期为T，质点由平衡位置到二分之一最大位移处所需要的时间为
【单选题】一质点作简谐振动,周期为T.质点由平衡位置向x轴正方向运动时,由平衡位置到二分之一最大位移这段路程所需要的时间为
A.
T/4
B.
T/6
C.
T/8
D.
T/12