麻疹以为外透顺,为()传逆。
参考答案:内
There's going _____ a sports meeting next Friday. [ ]
A. have
B. to have
C. to be
D. has
抛掷一枚不均匀的硬币,出现正面的概率为p(0<p<1),以X表示一直掷到正、反面都出现时所需要投掷的次数,求X的概率分布.