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民亭诉讼中的被告经（），无正当理由拒不到庭的，或者未经法庭许可中途退庭的，可以缺席判决.
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教学实施前，通常要进行一些教学准备工作，在下面的教学活动中属于教学准备活动的必要环节的为（）
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电动机温升B级为105℃。
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定程租船对运费的规定是（）。
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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（）.
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活动钢引桥升降架由（）、（）和（）三部分组成。
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治疗痰热阻闭心窍之神昏、口噤等症，应选用的药物是（）。
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在开式传动中齿轮主要的失效形式是（）。
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幼儿期保健的内容不包括（）。
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各级单位应当按照公司统一规定，全面应用（）报表功能编制会计报表和有关文档。