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【单选题】
描述性研究具有的特征是A.
以个体为单位收集和分析资料
B.
选择不同性质的人群进行对比
C.
随机抽样获得研究对象
D.
描述疾病的特点，可以提供病因线索
E.
论证强度高，可以验证病因假设
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【简答题】Mrs. White: Mrs. Green, could you do something for mc. please? Mrs. Green: Yes, of course, Mrs. White!______小题1: Mrs. White: Well, my husband and I are leaving for London for a holiday.________小题2: Co...
【简答题】阅读理解. Mr. and Mrs. White had different ideas about where to go that weekend. Mrs. White wanted to go to Hainan to see her sister, but Mr. White did not like to go there. He wanted to go to Dalian. 'Ha...
【简答题】阅读理解。 Mr. and Mrs. White had two sons and three daughters. One Sunday, Mrs. White said to her husband, 'The children don't have any lessons today,and you are free too. There's a new funfair (游乐场) in t...
【简答题】“Tom? Are you in bed yet?” called Mrs. White. There was no answer. Mrs. White put down her book and went to her 14-year-old son’s room. Tom was sitting in front of a bright computer screen on which a ...
【简答题】Mr. and Mrs. White had two sons and three daughters．One Sunday，Mrs. White said to her husband，“The children don’t have any lessons today，and you’re free too．There’s a new funfair(游乐场)in the park．Let’s...
【简答题】Mr. and Mrs. White had two sons and three daughters. One Sunday, Mrs. White said to her husband. The children don' t have any lessons today, and you're free too. There's a new funfair（游乐场） in the park...
【简答题】圆规使用时可以完成相应图形的绘制
【多选题】在汛期，水库、闸坝和其他水工程设施的运用，以下说法正确的是（）。
A.
必须服从有关的防汛指挥机构的调度指挥和监督
B.
在汛期，水库不得擅自在汛期限制水位以上蓄水
C.
其汛期限制水位以上的防洪库容的运用，必须服从防汛指挥机构的调度指挥和监督
D.
在凌汛期，有防凌汛任务的江河的上游水库的下泄水量必须征得有关的防汛指挥机构的同意，并接受其监督
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