油品调合的方法有哪几种?
参考答案:
压缩空气调合,泵循环调合,机械搅拌调合和管道调合
— Are you content with her lecture?
— Nowhere near that. It .
A.may have been good
B.couldn’t have been worse
C.can’t be better
D.must be better
When I was young, I have so much time, but these days I in school all day. [ ]
A. use to, stay
B. used to, stayed
C. used to, stay
D. use to, stayed