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【单选题】
两台机床加工同样的零件,它们出现废品的概率分别为 0.03 和 0.02 。加工出的零件放在一起。设第一台机床加工的零件比第二台的多一倍,则一个零件是合格品的概率为A.
71/75
B.
24/25
C.
73/75
D.
74/75
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B.
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C.
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D.
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