根据安全工程学的一般原理,危险性定义为事故频率和事故后果严重程度的()。
A、总和B、差值C、乘积D、除数
上一篇 We have the system of exploitation of man by man. [A] cancelled [B] abolished[C] refuse
下一篇 Britain has the highest _____ of road traffic in the world—over 60 cars for every mile
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