二项分布的概率分布图，分布对称的条件是（）
A.n>50
B.π=0.5
C.nπ=1
D.π=1
E.nπ>5
参考答案：B
------Where did you first meet your boyfriend?
------It was in the department store ______ he worked.
A．which
B．that
C．what
D．where
通常情况下，在我国保险人不得兼营人身保险和财产保险业务。( )
