This paper briefly expounds the technological design and smelting process of ZCuZn 40 Mn 3 Fel.主要论述了锰黄铜熔炼工艺设计及熔炼过程.Expounds liquid level control system of flotation machine and its industrial test.介绍浮选机矿浆液位控制系统及其工业试验过程.T...
assail a task着手完成任务By 1000 BC waves of invaders began to assail the land.到公元前约1000年,埃及遭受到蜂拥而来的入侵者的掠夺.Then doubts and fears did assail the very strongest.那时,疑惑和恐惧的确困扰过意志最坚强的人.You ought to assail all the difficulties that ...