(Ⅰ)当a=2时,求集合A∩B;
(Ⅱ)若A∩(∁UB)=∅,求实数a的取值范围.
The problem won't be settled until we ________a chance to discuss it thoroughly.
关于地球的第一宇宙速度,下列说法正确的是( )
下句中,只有一处错误,请找出并改正。
You can look for the word in the dictionary.
____