... differential piston gauge 差动活塞式压力表，差动活塞式压力计 differential plunger pump 差动柱塞泵 differential pressure 差压，压差 ...
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... diameter of plunger 柱塞直径 differential plunger pump 差动式柱塞泵; 差动柱塞泵 duplex plunger pump 双缸柱塞泵 ...
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