已知事件 A 与 B 相互独立, P ( A + B ) = 0.8 , P ( B ) = 0.5 ,则 P ( A ) =( )
A.
0.3
B.
0.2
C.
0.5
D.
0.6
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参考答案:
举一反三
【单选题】Since we have learned so many phonetic skills, shall we go through a test to see whether we have mastered all of them or not? Now please finish 1-5 questions, listen to me and choose the word that you...