题目内容

试分析造成该事故的原因。

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分析这起事故发生的直接原因和间接原因。

What is the value of v/w？
(1) w/v=-1.5
(2) v＞0

How many prime factors of x are also prime factors of y？
(1) x=30
(2) y is a multiple of x.

What is the ratio of 2a to b？
(1) a/b=2
(2) a+b=5