开管 meaning in Chinese

open pipe
open tube

The simplest type of pressure gauge is the open-tube manometer .
最简单的压力计，是开管流体压力计。
Experiment study on the determination of cod with the opened tube
开管消解测定法的试验研究
Nonextractable phase open tubular column npot
不可提取相开管柱
Immobilized phase open tubular column ipot
固定化相开管柱
Support - coated open tubular column scot
担体涂渍开管柱

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