什么情况下应对换热器进行检查和维修?
参考答案:
温度大幅度异常增高;换热器压降大于设计要求;换热器法兰垫片损伤严重。
Jet Li can ________. [ ]
A. does kung fu
B. Chinese kung fu
C. do Chinese kung fu
D. do China kung fu
In order to keep fit,you will take exercise_________ and eat healthily.
A.regularly
B.generally
C.extremely
D.approximately