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由于市售分析纯乙醛试剂中有聚合物存在，所以不能作为标准样品直接使用。
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当某一新疗法可防止死亡但不影响疾病恢复时，将会发生（）
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在精益六西格玛中，有关“Y”描述错误的是（）。
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水冷孔型的目的主要是防止发生缠辊现象。
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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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交床的中心是实的。
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人工呼吸。
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研究所配电房高压进线的电压为（）KV，按照国家规定，每两年应做一次预防性试验，以发现运行中设备的隐患，预防发生事故或设备损坏。
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宋代“二程”（（）、（））和（）的理学，使封建正统法律思想发展到一个新阶段，完成了哲理化。
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符合产褥期产妇身体变化特点的是（）