轻烃回收开工前的工作?
参考答案:
蒸汽贯通、水联运、氮气(气密、置换)、油联运、O2≤0.2%
(2013·辽宁五校第一联合体高三考试)—Who is the girl over there?
—Isn't that the secretary you want ________ the article?
A.to have type
B.her to type
C.to have typed
D.her type
汽车离合器应保证主、从动部分分离(),接合柔和、平顺。