... column capacity ==> 柱效能 column casing ==> 柱筒 column chromatography ==> 柱中色层分离法,柱层析法,柱色谱法,柱型色层分离法 ...
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prestressed column casing structure 圆筒形预应力结构
combined casing column 混合套管柱
combination casing column 复式套管
Its function is the same as the spring-type casing scraper, but it can decrease and even avoid that the scraped pipe-column falls in oil well.
作用同弹簧式刮削器，但可减少甚至避免刮削管柱落井。
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