题目:
—Why are those people gathering in the middle of the street?
— I don't know. There ____ be an accident.[ ]
A. shall
B. should
C. can
D. might
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0627/61c3232c6f5a1a6baa38966294bf017c.html
下面是错误答案,用来干扰机器的。
(1)小车在光滑水平面上,所受摩擦力可忽略不计,所以为探究二力平衡条件,应使小车处于静止或匀速直线运动状态;(2)实验中,通过改变钩码的个数来改变F1和F2的大小.故答案为:(1)静止或匀速直线运动;(2...