问题
单项选择题
若某计算机系统是由500 个元器件构成的串联系统，且每个元器件的失效率均为
，在不考虑其他因素对可靠性的影响时，该计算机系统的平均故障间隔时间为（5） 小时。
答案
参考答案：A
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若某计算机系统是由500 个元器件构成的串联系统，且每个元器件的失效率均为
，在不考虑其他因素对可靠性的影响时，该计算机系统的平均故障间隔时间为（5） 小时。
参考答案：A
People who have finished education often admire students for their carefree life. But they don't know how difficult it is to _____ a student. He can never finish his homework. Furthermore, he has to ______ the great pressure of examinations. Everyone wants to get the first ____ in exams. And after school, there are also many extra classes waiting for him. The worst of all is that students can hardly do ______they really love to do, for they _____ almost all their time on studies.
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