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用乙酰丙酮分光光度法测定水样中甲醛时，已配制好的大约1mgl的甲醛储备液，置冰箱4℃下可保存（）。
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天王补心丹的主治病机是（）.
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为规范银行业金融机构固定资产贷款业务经营行为，加强固定资产贷款审慎经营管理，促进固定资产贷款业务健康发展，依据《中华人民共和国银行业监督管理法》、《中华人民共和国商业银行法》等法律法规，制定《固定资产贷款管理暂行办法》。（）
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心脏由左右两个心泵组成。右心将血液泵入人体循环各个器官，当右心室收缩时，血液随即射入主动脉。（）
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作尺度分析，为什么不从原始方程出发，而应用以静止大气为背景的方程组？
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若在有分布式电源接入的低压配电网上停电工作，至少应采取哪些措施之一防止反送电？
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装入制度
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一个组织的最高管理者主持对本组织的质量管理体系的充分性、适宜性和有效性进行的评审是（）
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对桁架结构的起重机，节点板是发生裂纹较多的部位。
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Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death. Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised. First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent . Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth. By "dropout" the author means（）.