在此情形下，利用几何过程和补充变量法求得了该系统首次故障前的平均时间及另一些感兴趣的可靠性指标。
Under these assumptions, some reliability indices are derived by using the geometric process and the method of supplementary variable.
利用几何过程，以系统大修次数N和大修时间间隔T为更换策略，选择最优策略（ N ， T）使系统经长期运行单位时间的期望费用最小。
The problem is to determine the optimal replacement policy ( N , T )? such that the long-run expected cost per unit time is minimized.
利用初等几何 求角 x. 写出求解过程.
Using only elementary geometry, determine angle x. Provide a step-by-step proof.
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