指出从改善弹簧管的材质入手来提高含硫天然气管道用压力表的寿命是不可取的。
It is not advisable to lengthen the pressure gauge service life of sulfurous gas pipeline by improving the material behavior of spring tube.
快速树干注射器主要由贮液瓶、压力表、弹簧秤、输液管、注药口、气门嘴、注射针头、开关等几部分组成。
The quick trunk injector comprises a reservoir pressure-meter, a spring balance, a transfusion pipe, a liquid valve, an air pinhead and a switch.
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