CRH1A型动车组每个客室空调有（）台压缩机。
A.1
B.2
C.3
D.4
参考答案：B
________ excited Geoff Marcy most was ________ there were planets in other solar system where life might exist.
A．It; if
B．That; whether
C．What; whether
D．What; that
设随机变量X与Y相互独立同分布，其中
令U=max(X，Y)，V=min(X，Y)．
求P{U=V
