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当前学科：初级轨道车司机
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在一个区段内，所用扼流变压器总数应考虑轨道变压器供电电压和保证轨道电路分路检查的要求，一般不应超过（）台。
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推荐知识点:
目前所知体内功能最强的抗原提呈细胞是
纳米技术相关的现代技术包括（）。
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．
可精确切割不同组织，最适于镫骨手术的是（）。
俗语“天上无云不下雨，地上无媒不成亲”表现了（）在传统婚姻中的重要性。
正常精液，极少见（）
（）吊具适用于非多孔性的各种板材，如钢板、铝板、混凝土板、大理石板等，这种吊具还特别吊运玻璃。
试述设备入井的有关规定。
如果三相异步电动机三相绕组首尾相连，这种接线方式称为（）
施工现场的下列（）场所应配备临时应急照明。