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【简答题】
(2006年)微分方程 满足初始条件y｜x=1=0的特解是( )。
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举一反三
【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.
被调查人群是以随机抽样的方式获得的
D.
描述疾病分布的特点,可提供疾病的病因线索
E.
论证强度高,可以验证病因假设
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【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
【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.
被调查人群是以随机抽样的方式获得的
D.
查描述疾病分布的特点,可提供疾病的病因线索
E.
论证强度高,可以验证病因假设
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