一简谐横波正在沿着轴的正方向在弹性绳上传播，振源的周期为0.4s，波的振幅为0.4m，在时刻的波形如图所示：则在+0.2s时，

题干

一简谐横波正在沿着

轴的正方向在弹性绳上传播，振源的周期为0.4s，波的振幅为0.4m，在

时刻的波形如图所示：则在

+0.2s时，

A：质点正处于波谷

B：质点正经过平衡位置向上运动

C：质点通过的总路程为1.2m

D：质点正处于波峰

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A

Time now	It's ____ in the morning.
Weather information	Snow has been falling since yesterday.
Suggested ways of transportation(交通工具)	____.
Influence to the school	Some schools in the countryside are ____
More information about the weather	____ will last for at least two more days.
Time for the next ____.	In two hours