standing valve ball 固定阀球
The barrel, plunger and standing valve of the pump were designed, improving the barrel's force conditions and reinforcing the screw thread's sealing performance and tensile strength.
该泵对泵筒、柱塞、固定阀做了设计，改善了泵筒受力状况，提高了螺纹的密封性能和抗拉强度。
Varicose veins are veins venous valve function damaged, mostly congenital causes, and long standing or long time to maintain a posture is its inducement of.
静脉曲张主要是血管中静脉瓣功能出现损坏，多是先天性原因造成的，而久站或长时间保持一个姿势只是它的诱因之一。
He continues a long-standing artistic tradition of imagining the end of civilization, a form of emotional and spiritual escape valve operated since man found a means to express himself.
他长期以来保持着对文明终结的艺术性想象，这是一种情感和精神的宣泄形式，并以此表达自我。
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