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《血站管理办法》第二十四条血站采集血液应当遵循（）。
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保险资金运用方面的要求有()。A.负债性B.流动性C.安全性D.收益性E.短期性
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密质骨结核的X线表现为（）
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患儿，6个月，近来出现夜间哭闹，多汗，精神烦躁等症状，头枕处头发变稀，此时应首先添加的是（）
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回答题Human needs seem endless．They might be regarded as making up several levels．When there is enough money to satisfy one level of needs, another level appears．The first and most basic level of needs involves food．Once this level is satisfied, the second level of needs, clothing and some sort of shelter, appears．By the end of World War Ⅱ , these needs were satisfied for a great majority of Americans．Then a third level appeared．It included such items as automobiles and new houses．By 1957 or 1958 this third level of needs was fairly well satisfied．Then, in the late 1950s, a fourth level of needs appeared: the "life-enriching level．While the other levels involve physical satisfaction, that is, the feeding, comfort, safety, and transportation, this level stresses mental needs for recognition, achievement, and happiness．It includes a variety of goods and services．Among them are vacation trips, the best medical and dental care, and recreation．Also included here are fancy goods and the latest styles in clothing．On the fourth level, a lot of money is spent on services, while on the first three levels more isspent on goods．A fifth level would probably involve needs that can be achieved best by community action．Consumers may be spending more on taxes to pay for government action against disease, ignorance, crime, and prejudice．After filling our stomachs, our clothes closets, our garages, our teeth, and our minds, we now may seek to ensure the health, safety, and leisure to enjoy more fully the good things on the first four levels．According to the passage, man will begin to think about such needs as housing and clothing only when________
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三相变压器的空载电流谐波一定大于单相变压器的谐波含量。（）
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桥面铺装的养护与维修内容
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妇女绝经过渡期自主神经功能紊乱最明显症状是（）
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食品工厂的用电负荷计算一般采用什么方法？