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【单选题】
设 10 件产品中有 3 件不合格品,从中 不放回地取两次 ,每次一件,则取出 的第二件为不合格品的概率( )
A.
3/10
B.
1/5
C.
1/15
D.
49/100
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参考解析：
刷刷题刷刷变学霸
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【单选题】第二篇 Sleep We all know that the normal human daily cycle of activity is of some 7 - 8 hours’ sleep alternating with some 16 - 17 hours’ wakefulness and that, broadly speaking, the sleep n...
A.
people hate the inconvenience of working on night shifts.
B.
your life is disturbed by changing from day to night routines and back.
C.
not all industries work at the same hours.
D.
it is difficult to find a corps of good night workers.