The barrel, plunger and standingvalve 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。
2
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.
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.