The table of standard normal distribution was handled correctly by use of Raphson numerical integral, by this way, the optimum design was connected with reliability design organically.
文中提出采用辛卜生数值积分较好地处理了正态分布数值表，从而将优化设计与可靠性设计有机地结合起来。
The optimum test design is obtained to minimize variance of least square estimation of the mean life at a normal stress level.
这里的最优准则是指正常应力水平下产品对数平均寿命估计的方差的极小化。
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