If the police arrived earlier, they would_爱下问搜题

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问题单项选择题

If the police arrived earlier, they would have seen the accident.

答案

参考答案：arrived→had arrived

单项选择题

假定大量的测量误差均服从正态分布，一般取（）为随机误差的极限误差。

A.σ

B.2σ

C.3σ

D.4σ

问答题简答题

有人认为，矛盾双方的转化就是发展。请简要评析这一观点。