随机变量X的概率分布Y 表示 X 被 3 除的余数 ,则E(Y) = ______.
8/7
我国社会主义改造全面推开是从 _______年开始的。
著名的罗马圆形大竞技场建于罗马帝国的 ()
________ with the size of the whole earth, the highest mountains do not seem high at all.
________ they've got to know each other a little better, they get along just fine.
用和平赎买的方法对 _________进行改造。