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【单选题】
图5.1-1中，f(t)表示故障密度函数，则下列说法正确的是( )。A.
A部分的面积代表的可靠度R(t0)
B.
F(t0)表示的是t0时刻产品的不可靠度
C.
B部分的面积代表的是不可靠度
D.
F(t0)+R(t0)≠1
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【单选题】What does the writer realize now that he did not realize then?
A.
How difficult it can be to get a job.
B.
How unpleasant ordinary jobs can be.
C.
How badly he did in the interview.
D.
How unsuitable he was for the job.
【单选题】What does the writer realize now that he did not realize then?
A.
How difficult it can be to be a poet.
B.
How unpleasant ordinary jobs can be.
C.
How badly he did in the interview.
D.
How unsuitable he was for the job.
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