primary valve

"Primary uses for wrot brass are for ball valve stems and balls, and iron valve stems. a forging grade of brass is used in ball valve bodies and pieces." Dynamic Analysis of a Spindle of Pilot-operated Solenoid Valve

黄铜的主要用途是球阀阀杆和球体，和铸铁阀门的阀杆。可锻黄铜可用于球阀阀体和断口部件。两级先导式电磁阀主阀芯动力学分析

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Objective To evaluate the therapeutic effect of valve trabeculotomy for primary glaucoma.

目的评价活瓣式小梁切开术治疗原发性青光眼的远期疗效.

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Conclusion. A significant association between primary bloodstream infection and a needleless connector valve was observed.

结论:可以观察到在主要血流感染和无针导管接管单向阀之间存在显著相关.

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Reconstruction of the primary anal sphincter with valve of the gluteus maximus musculus used on low rectal and anal carcinoma

臀大肌瓣重建原肛位括约肌用于低位直肠癌与肛管癌

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This paper explains the image expansion and confusion of the red and blue primary colours caused by the electric charge accumulation on the oil film in the colour TV light valve tube.

本文对油膜光阀管中电荷积累现象引起的图象扩大和红、蓝原色不能正确显示的原因进行了解释。

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