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。
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.
浮钟式压力计可以用来测量计示压力或差压力。
Bell gages may be used to measure gage pressure or differential pressure.
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