正常运行中磨煤机的总风量不应低于额定总风量的()。
A、80%
B、60%
C、70%
参考答案:A
用括号内所给词的适当形式填空。
1. Do you want (go) to a movie?
2. Maria likes thrillers but she (not like) comedies.
3. I often go (see) it.
4. Does your parents (want) to see action movies?
下列各项,在血液运行中起关键作用的是 ()
A.心血充盈
B.脉道通利
C.心气充沛
D.心神安宁
E.心阳亢盛