试题与答案

道路交通标志是道路重要的组成部分,主要以自己特有的()和文字向交通参与者传递特定信息

题型:多项选择题

题目:

道路交通标志是道路重要的组成部分,主要以自己特有的()和文字向交通参与者传递特定信息。

A.形状

B.符号

C.颜色

D.图案

E.声音

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:根据动量守恒定律得,Mv0=m1v1+m2v2.0.6×10=0.2×250+0.4×v2,解得v2=-110m/s.负号表示方向,与v0反向.故B正确.

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