韩国Psy去年以舞曲《江南Style》暴红，该曲MV截止至2013年1月1日在影

已知集合U={1，4，7，8，9}，A={4，7，9}，则C_UA=______．

This year this factory has produced ________ cars as it did last year.

A．as more than three times many

B．more than three times many as

C．more than three times as many

D．three times as more than many

《窦娥冤》里面放高利贷的是（）

A、张驴儿

B、蔡婆

C、窦天章

D、梼杌太守

自动空气开关在线路中起什么作用？

绝热闪蒸与等温闪蒸计算不同点是需要考虑（）。