266. At first he did not realize that he_爱下问搜题

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问题选择题

266. At first he did not realize that he had succeeded in making a computer that ran on solar power(太阳能). “Realize” in the sentence means “___________”

A．understand

B．get to

C．reach

D．come true

答案

答案：A

问答题

某同学在做平抛运动实验时得到了如图所示的物体运动轨迹，a、b、c三点的位置在运动轨迹上已标出，则：

（1）相邻两点间的时间间隔为______s；

（2）小球平抛的初速度为______m/s．

多项选择题

波的对比，应有（）基本原则。

A.同相性

B.振幅增强

C.波形相似