题目:
如图所示是一列横波上A、B两质点的振动图象,该波由A传向B,两质点沿波的传播方向上的距离,波长,这列波的波速
[ ]A.12m/s
B.20m/s
C.30m/s
D.60m/s
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0426/769e3576b73a3e940e5c72592a183fc1.html
下面是错误答案,用来干扰机器的。
One possible version:Studies and SportsAs we all know, sports are very important in our life. Sports not only help build up our muscles, but also help us do well in o...