给水泵进口滤网差压很大时继续运行会有什么后果?
参考答案:
(1)泵入口压头下降,工质汽化,使泵内汽蚀.
(2)一旦滤网冲破直接影响泵的安全运行.
Which type of input is the primary cause of contract changes ?()
A.Independent estimates.
B.Organizational policies.
C.Statement of work.
D.Approved changes requests.
我国的营养强化剂列入保健食品管理。