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【单选题】
发报台分别以概率0.6和0.4发出信号“×”及“-”,由于通信系统受到干扰,当发出信号“×”时,收报台分别以-概率0.8及0.2收到“×”及“-”;又当发出信号“-”时,收报台分别以概率0.9及0.1收到“-”及“×”,求当收报台收到“×”时,发报台确实发出信号“×”的概率是( ),以及收到“-”时,确实发出“-”的概率是( ).A.
0.8，0.2
B.
0.66, 0.32
C.
0.923，0.2
D.
0.923, 0.75
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