closed piping system
... closed path 闭合通路 closed piping system 封闭管道系统 closed position 闭合位置，停止位置 ...
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... closed path ==> 闭合电流,闭合回路,通路 closed pipe system ==> 封闭管道系统 closed planer ==> 龙门刨床 ...
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该系统是封闭管道联接，由软件自动控制，节省了人力物力，避免了操作中的污染，减少了蛋白的损失。
This system was joined by pipelines and could achieve automatic control of the whole purification process, which can save manpower, material, and avoid contamination in the operation.
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