问题
单项选择题
某计算机系统由图1-2所示的部件构成，假定每个部件的千小时可靠度为R，则该系统的千小时可靠度为（）。
A．R+2R/4
B．R+R2/4
C．R(1-(1-R)2)
D．R(1-(1-R)2)2
答案
参考答案：D
解析：
[分析]： 并行的可靠度=1-(1-R)(1-R)
总可靠度=(1-(1-R)(1-R))·R·(1-(1-R)(1-R))
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某计算机系统由图1-2所示的部件构成，假定每个部件的千小时可靠度为R，则该系统的千小时可靠度为（）。
A．R+2R/4
B．R+R2/4
C．R(1-(1-R)2)
D．R(1-(1-R)2)2
参考答案：D
解析：
[分析]： 并行的可靠度=1-(1-R)(1-R)
总可靠度=(1-(1-R)(1-R))·R·(1-(1-R)(1-R))
Dear Seth, You are only three years old, and at this point in your life you are not able to understand this letter. But some day when you___36___, I hope you will find something __37__in what I am going to share with you. Life can be __38__ . There will be people in your life who won’t be very nice. They’ll __39___ you because you are different, 40 for no good reason . You will also face heartbreak and might be __41__ by those you love. I hope you don’t have to face these too much , but such things __42__. Be open to life anyway. You’ll find cruelty(残忍) and 43 in your journey through life , but don’t let that__44__ you from finding new things . Don’t retreat （退却）from life , and don’t __45__ or wall yourself off . Be open to new things , new experiences ,and new people . You will __46__ many times ,but if you allow that to stop you from trying , you will __47_ many chances . Do remember failure is a stepping stone to __48__. You will meet many people who will try to do __49__ than you , in school, in college, and at work. They’ll try to have nicer cars, bigger houses, nicer clothes, and so on. . To __50_ , life is a competition.However, I believe life is a __51_. If you always try your best to __52__ others, you are wasting your life . Learn to enjoy your life__53_ and you will make it a journey of __54__ ,of learning and of love. Finally , know that I love you and always will. You are _55__ a really wonderful journey , and I will always be there for you. Love Dad
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