valve assembly短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 活门组件,气门组件 The failure of a downhole hydraulic piston pump is mainly due to the trouble of its reversing valve assembly. 换向机构失效是引起水力活塞泵井下故障的主要原因。 cnki Vacuum gauge and valve assembly can optimize the flow of samples. 使用真空表和排气阀优化样品流速。 www.instrument.com.cn