Failure is never quite so frightening as regret do.比失败更令人恐惧的是懊悔。Success is not final, failure is not fatal: it is the courage to continue that counts.--Winston Churchill成功不是终点，失败也并非末日，最重要的是继续前进的勇气。It is the easy way out ...
Flotation is used for Florida and Kola rock.浮选操作法用于佛罗里达磷矿和科拉磷矿.Flotation is a process for separating low density solids or liquid particles from a liquid phase.浮选是从液体中分离出低密度固体物或液态颗粒.Expounds liquid level control system o...