First drives an expression of expected completion time in order to get the equivalent form of the objective function.

为了得到目标函数的等价形式，首先导出期望完工时间的一个表达式。

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Then three exact formulae for calculating the expected test time are derived and proved briefly equivalent each other.

然后给出三种计算期望试验时间(ett)的精确公式，并简略证明它们是等同的。

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Then three exact formulae for calculating the expected test time are derived and proved briefly equivalent each other.

然后给出三种计算期望试验时间(ett)的精确公式，并简略证明它们是等同的。

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