The cerusite can be collected by xanthate without sulfuration, however the flotation indexes are not good.在不硫化的条件下,黄药能够浮选白铅矿, 但浮选指标不高.Expounds liquid level control system of flotation machine and its industrial test.介绍浮选...
Finding a volunteer to write the computer program isn't a problem.找个志愿者编这个计算机程序不成问题。She often does volunteer labour during holidays.放假时她常去参加义务劳动.Victory in the civil war had been achieved by a mainly volunteer army....
Double rhythms, resounding through the lyric depiction and connecting with each other , indicate the thespian place of mankind and the cognition of the writer to this thespian place.这双重旋律互为表里, 表明了人类的某种悲剧性处境以及作家对这种悲剧性处境的感...