Oil and gas well drillers, servicers, testers and related workers.
石油和天然气钻井工人，服务人员，测试人员及有关人员。
Deadweight testers are used to measure the pressure exerted by gas or liquid and can also generate a test pressure for the calibration of numerous pressure instruments.
静重试验器用于测量气体或液体的压力，也可以生成一个众多压力仪器的校准试验压力。
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