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【多选题】
现况研究的目的和任务有A.
描述疾病的地区分布
B.
描述疾病的人群分布
C.
验证疾病的病因
D.
检出现患病例
E.
检出病原携带者
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反馈参考答案：
举一反三
【单选题】压焊的主要特征是
A.
焊接过程中母材金属处于熔化状态,经冷却后形成焊缝,将焊件连接在一起
B.
焊接过程中母材不熔化,只有焊料熔化
C.
焊接过程中需对焊件施加压力,使焊件产生塑性变形、原子间相互扩散而实现连接
D.
是一种通过冷凝实现连接的焊接方法
【简答题】take from one place to another
【简答题】You go from one place to another.
【简答题】We know that many animals do not stay in one place. Birds,fish and other animals move from one place to another at a certain time. They move for different reasons: most of them move to find food more...
【简答题】A．one place B．the place C．places D．the places
【简答题】We know that many animals do not stay in one place. Bird, fish and other animals move from one place to another at a certain time. They move for different reasons: most of them move to find food more ...
【简答题】We know that many animals do not stay in one place.Birds,fish and other animals move from one place to another at a certain time.They move for different reasons:most of them move to find food more eas...
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