【简答题】(1)以黄铜矿冶炼金属铜的过程中发生反应:2Cu 2 O+Cu 2 S 6Cu+SO 2 ↑,反应的氧化剂是_________。 (2)黄铜矿熔炼后得到的粗铜含少量Fe、Zn、Ag、Au等金属杂质,需进一步采用电解法精制。在电解精炼铜时,电解液中除了硫酸铜外,往往再加入一些硫酸,其作用是_____________________。 (3)在精炼铜的过程中,电解液中c(Cu 2+ )逐渐下降,c(F...
【单选题】造锍熔炼目的是使精矿中的铜及有价金属富集于( )中,达到与脉石及部分铁、硫分离的目的。
【判断题】日语专业的实践教学包括课上实践教学环节和集中实践教学环节。
【简答题】The coldest and most difficult place in the world in which to live is Antarctica. Antarctica is the land of snow and ice near the South Pole. Most people do not think there is much life in the icy wat...
【单选题】患者男,68岁。因阿尔茨海默病入院治疗。今晨进食馒头、豆浆时,突然面色发紺,双眼瞪大,意识丧失。应立即采取的措施是
【简答题】A.In the place of B.In place of C.Besides D.Except
【简答题】the fact that a total transformation is going to take place in the future in the delivery of all forms of entertainment.
【单选题】Despite the changes that had taken place in the structure of the empire and in the political, economic, and social patterns of Great Britain, royalty continued to hold its unique and________ place in ...