The presentation of usage of liquid column manometer. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.
主要介绍了液柱压力计的正确使用方法和误差分析。给出了U 型管压力计和双管差压计的测量精度。
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。
The __toString() method includes the XML header and namespace declarations required for correct use of the Activity Streams vocabulary. Listing 9 shows the addEntry() and __toString() methods
__toString() 方法包含了正确使用 Activity Streams 词汇表所需要的 XML 头和名称空间声明。
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