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电镜下具有周期性横纹的结构是（）。
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下列属于无线电示标台发射信号的格式有（）。
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中医养生保健学的基本特征有（）。
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在一机多票开票子系统V6.15中，更改开票员权限是在（）模块中实现的，发票资料查询打印是在（）模块中实现的。
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企业网银系统的查询服务包括（）。
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凡是要求在低温条件下（一般指2-8℃）储存的药品，如（）、生物制品、血液制品、疫苗等都属于冷藏药品范畴。
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A: I've come about your offer for bristles. B: We have the offer ready for you． Let me see..． Here it is． 100 cases of Tsingtao Bristles, 57mm, at..． pounds sterling per kilogram, CIF European Main Ports, for shipment in June, 2009． The offer is valid for three days. A: Why, your price has soared．It's almost 25 % higher than last year's． It would be impossible for us to push any sales at such a price. B: I'm a little surprised to hear you say that． You know very well that market for bristles has gone up a great deal in recent months． The price we offer compares favourably with quotations you can get elsewhere. A: I'm afraid I can't agree with you there． I must point out that your price is higher than some of the quotations we have received from other sources. B: But you must take the quality into consideration． Everyone in the trade knows that China's bristles are of superior quality to those from other countries. A: I agree that yours are of better quality． But there's competition from synthetic products, too． You can't ignore that prices for synthetic bristles haven't changed much over the years. B: There's practically no substitute for bristles for certain uses． That's why demand for natural bristles keeps rising in spite of cheaper synthetic ones． To be frank with you, if it were not for the long-standing relationship between us, we would hardly be willing to make you a firm offer at this price. A: Well, we'll have a lot of difficulties in persuading our clients to buy at this price． But I'll have to try, I suppose.
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房性心动过速根据发生机制与心电图的表现可分为（）
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什么情况下带电作业须进行现场查勘？
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供应链管理中的各个节点企业都是相互独立的，不能形成一个整体（）