题目内容

Some typical hazards in various systems are electrical discharge or shock, fire or explosion, rapid pressure release, and extreme high or low temperature. Of course, a hazard can be the result of a system or component failure, but it isn’t always. Failure and hazard are frequently linked. There is an occupational hazard (no pun intended to ) associating the two.

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A hazard can exist without anything failing. In other words, an engineer can actually (unintentionally of course) “design” in a hazard. To be successful in system safety engineering we must look not only at failures and their associated hazards but also at the normal system operation and its hazards.

There are risks always. There is a risk staying in bed and a different risk getting out of bed. As much as we would love to have zero risk, that is a practical impossibility. Because we cannot totally eliminate risk, we try to shrink it as much as possible. This can be done by lowering either the probability or the severity of the hazard, or both.

基尔霍夫定律的相量表示式为 Ʃi(t)=0,Ʃu(t)=0。

A. 对
B. 错

运算形式的基尔霍夫定律表示为 ƩI(S)=0,ƩU(S)=0。

A. 对
B. 错