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【单选题】
计算机运行时，两次故障之间系统能正常工作的时间的平均值被称为(9)，记为MTBF。 MTBF与失效率有直接关系，所谓失效率是指单位时间内失效元件数与元件总数的比，设为λ。则MTBF= 。A.
平均无故障时间
B.
平均修复时间
C.
平均可用时间
D.
平均故障时间
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举一反三
【简答题】The heavy snow could not keep us__________going out to work．
【单选题】The freezing point is the temperature _______ water changes into ice.
A.
at which
B.
on that
C.
in which
D.
of what
【简答题】None of us could speak the language (speak) ______ in that area, so we took an interpreter with us.
【单选题】To solve the problem, we would appreciate it if you could give us an ______ explanation and compensate (补偿) us.
A.
abundant
B.
adequate
C.
approximate
D.
awesome
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