All these people are now making an activ

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问题选择题

All these people are now making an active to improve our environment.

A．effect

B．effort

C．decision

D．affect

答案

答案：B

计算题

在水平地面上有一个质量为4kg的物体，物体在水平拉力F的作用下由静止开始运动。10s末拉力减为F该物体的v-t，图象如图所示。求：

小题1:物体受到的水平拉力F的大小

小题2:物体与地面间的动摩擦因数。(g=10m/s²

选择题

I hope you _____ to my office as soon as possible.

A．to come

B．come

C．came

D．will come