鉴于此，本文从累积失效率出发给出了系统结构函数的另外一种定义。

So, the paper gives another definition of systematic construction function from accumulated invalid rate of systems.

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当产品的寿命分布为指数分布时，其密度函数为，(2)其中为指数分布的失效率。

Exponential distribution: the density function is as follows, (2) in which is the failure -rate of the.

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当产品的寿命分布为指数分布时，其密度函数为，(2)其中为指数分布的失效率。

Exponential distribution: the density function is as follows, (2) in which is the failure -rate of the.

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