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当前学科：循环水操作工
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离心泵在运行过程中，空气漏入泵内造成（），使泵不能正常工作。
A . 汽阻
B . 汽缚
C . 汽蚀
D . 汽化
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George: Mr． Zhang． Thank you for your invitation of visiting your company． I hope we can materialize some deals with you soon． Zhang: Mr． George, we are pleased to have the opportunity to meet you here in our company． After you have seen the presentations in our show room, would you tell me which particular items are really of interest to you? George: I had studied your catalogue before I saw your presentations in the show room． We are interested in your silk dresses． I think there will be a prospective market for some of them in AmericA．Here is a list of our requirements, for which I hope to have your lowest offer, CIF New York． Zhang: Thank you for your inquiry． Could you please let us know the quantity you require so that we can make the offers? George: I'll do that． Meanwhile, would you give me an indicative price? Zhang: SurE．Here are our FOB price lists． All prices in the lists are subject to our final confirmation． You will find the prices are reasonable． George: What about the commission? Zhang: Usually, our principle does not allow any commission． George: From European suppliers, in the regular practice, we usually get a 3 to 5 percent commission for imports． You know, we do business on commission basis． Moreover, a commission will help us to promote sales． Zhang: Well, if the order is really large enough, we may take the commission into consideration． I think it will be better to consult this when you order the goods． George: OK． Then I will write down the quantity for each item on the enquiry list． Can you tell me when we can have your offer? Zhang: Tomorrow morning． Could we meet again tomorrow afternoon for further details? George: Fine．
法律与宗教的区别表现在( )。A．产生的历史条件不同B．来源不同或产生方式不同C．调控范围不同D．作用对象不同