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根据输入信号来改变被控制线路通、断状态的电动执行元件。
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游泳运动
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接力游泳
每队4名运动员,通过接力的形式游完限定距离,以每队的总成绩决定名次的集体性游泳比赛项目。
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①中继 ②继电器 ③转像系统
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drilling fluid cake sluggish coefficient
drilling fluid circulation system
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drilling fluid mechanics
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