冷冻蛋液的解冻时间为()
A、8小时
B、9小时
C、10小时
D、12小时
参考答案:A
已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则CUA和CUB公共元素的个数为( )
A.2
B.3
C.5
D.6
I’m afraid I have to go out now.If phones, tell I’ll be back later.
A.anyone; them
B.someone; it
C.everyone; them
D.anyone; it