UPS输入电压允许误差()%,输出电压允许误差2%。
A.10
B.20
C.30
D.40
参考答案:B
This programme is a ___TV show, so you can call the station directly to vote for your favourite singer.
A.alive
B.lively
C.live
D.lovely
I'm not feeling _____. I have a headache.[ ]
A. good
B. well
C. best
D. ill