The float shoe prevents reverse flow, or U-tubing, of cement slurry from the annulus into the casing.
浮鞋能够防止环空中的水泥浆向套管内流动这种回流或者U型管效应的发生。
The precision of liquid column manometer was described. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.
叙述了液柱式压力计的精度，对U形管压力计和双管差压计的正确使用方法及误差修正做了简要分析。
A part that operates by sliding, as the U-shaped section of tube on a trombone that is moved to produce various tones.
型滑管：靠滑动操作的部分，如长号上u型的管子部分，拉动它可以产生各种声调。
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