溴冷机的气密性试验应进行如下工作（）。
A.正压检漏、补漏
B.负压检漏
C.直至机组气密性达到合格为止
D.直至机组绝对不漏为止
参考答案：A, B, C
根据句意，用括号中所给词的适当形式填空。
1．He_________ (have) lunch at school every day.
2．Look! He is_________ (run) on the street.
3．Tom wants_________ (drink) some water. He is thirsty
4．Noodles__________ (be) my favourite food
5．Would you like_________ (watch) TV after supper?
