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