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【单选题】
一个机床有1/3的时间加工零件A, 其余时间加工零件B, 加工零件A时, 停机的概率是0.3, 加工零件B时, 停机的概率是0.4, 这个机床停机的概率为( )
A.
1/3
B.
1/4
C.
11/30
D.
2/3
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