外有重型的铁闸，并通过了栅栏。
暗杆-内螺纹结构用于青铜和铸铁闸阀。
Non-rising-inside screw stems are used in bronze and iron gate valves.
本文对含磷蠕墨铸铁闸瓦的摩擦系数与耐磨性进行了系统的研究。
The friction coefficient and wear resistance of compacted graphite cast iron brake shoes with phosphorous are systematically investigated in this paper.
应用推荐