... optical plumb 光测悬线,光测垂线,... set plumb 挂直 rubber dam plumb 橡皮障吊锤 ...
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This article gives an easy way in which laser plumb line is set up by means of He-Ne laser in space with the liquid level as the base.
本文叙述以液面为基准面，用小型氦-氖激光器在空间建立激光垂直线的简易方法。
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