设A,B,C为三个随机事件 ,且P(A)=P(B)=P(C)=1/4,P(AB)=0,P(AC)=P(BC)=1/12,则A,B,C中恰有一个事件发生的概率为()
D
Hot metal ________ as it grows cooler.
中国共产党在过渡时期总路线的主体是 ____________。
He fell asleep immediately last night; he must ________ (be) very tired.
1953 年，为解决粮食供应紧张问题，我国采取的新措施是 ()
It was three British sportsmen who ________ banned drugs.
