A:talked , sat
B:talking, sitting
C:talking , sat
D:talked; sitting
设全集U={1,2,3,4,5},集合A={1,2},B={2,3},则A∩(∁UB)=( )
利用计算机在区间(0,1)上产生两个随机数a和b,则方程 bx=2a-x有实根的概率为( )
用绳子的拉力牵引着,使小球绕中心做圆周运动,可以类比( )
一What did you do last weekend? 一I stayed at home all weekend and slept.
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