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客户办理电子国债业务，必须在（）下开立国债托管账户。
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工作人员接受的集体剂量小的辐射实践就是正当的。（）
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慢性隐匿型细菌性痢疾的临床特点是（ ）
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建筑工程冬期施工规程（JGJ104-2011）：砌筑施工时，砂浆温度不应低于（）℃
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办税服务厅应当对办税服务的（）做出公开承诺，自觉接受纳税人的监督。
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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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起诉
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在教学过程中，如何有效的提供学习内容是教学策略的核心内容。
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若某人在乙处上空观察，此人所见的经纬网为下图中的（）。
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环孢素治疗AA的疗程一般长于（）