若事件A,B为对立事件,且P(A)>O,则P(B|A)=().
参考答案:0
解析:
利用对立事件的定义及条件概率的计算公式. 对立事件:A+B=Ω,AB=,则P(AB)=0.
The price of the goods in this shop is too high. I can buy only half the goods I bought in that shop and I’m paying ________.
A.as three times much
B.as much three times
C.much as three times
D.three times as much
茫茫黑夜,万籁俱寂.一只田鼠贼头贼脑从洞口探出头来,没有发现什么危险的迹象,它*
根据本文,响尾蛇最容易发现和逮住田鼠等小动物的原因为()
A.田鼠等小动物爬行时发出“吱吱”的声音
B.田鼠等小动物体格小容易被抓住
C.田鼠等小动物身体发出的红外线的波长在0.01毫米左右
D.田鼠等小动物最容易进入到响尾蛇的伏击圈