题目内容
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.
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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。
运算形式的基尔霍夫定律表示为 ƩI(S)=0,ƩU(S)=0。
电感L的运算阻抗为sL。
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