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【简答题】
(1)以黄铜矿冶炼的过程中发生反应：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(Fe 2+ )、c(Zn 2+ )会逐渐增大，所以需定时除去其中的Fe 2+ 、Zn 2+ 。下表为几种物质的溶度积。 某同学设计了如下除杂方案 试剂a是__________，其目的是______________________；根据溶度积该方案能够除去的杂质金属阳离子是______。操作①用到的玻璃仪器是____________。 (4)工业上通常用FeS除去废水中的Cu 2+ ，写出该沉淀转化离子方程式__________________。
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参考答案：
举一反三
【单选题】听力原文：What kind of insurance do you have? (A) We have health insurance. (B) The insurance agent is very kind. (C) Because it's necessary. (39)
A.
B.
查看完整题目与答案
【多选题】以下属于通用原始凭证的有( )。
A.
增值税发票
B.
差旅费报销单
C.
商业汇票
D.
支票
查看完整题目与答案
【简答题】According to your instructions to insurance, we have today taken ______ marine insurance ______ 50000 Yuan ______ your color TV shipment.
查看完整题目与答案
【简答题】If you have an open policy with your insurance company, we do not object _____________ covering insurance at your end.
查看完整题目与答案
【单选题】Since you desire to have your shipment effected insurance against TPND we can arrange such insurance ___________.
A.
on your account
B.
on your cost
C.
at your cost
D.
at your account
查看完整题目与答案
【多选题】以下属于原始凭证的有( )
A.
工资结算汇总表
B.
现金支票存根
C.
通用记账凭证
D.
汇总原始凭证
查看完整题目与答案
【单选题】Your life insurance should be enough to ____any funeral costs as well as debts that you may have accumulated.
A.
adopt
B.
hold
C.
cover
D.
load
查看完整题目与答案
【多选题】以下所列属于原始凭证的有 ( ) 。
A.
入库单
B.
经济合同
C.
增值税专用发票
D.
增值税普通发票
查看完整题目与答案
【简答题】______ your information, we have taken out an open policy ______ the Lloyd Insurance Company, London.
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【单选题】For your information, we have ______ an open policy with the Lloyd Insurance Company, London.
A.
made out            
B.
turned out
C.
worked out            
D.
taken out
查看完整题目与答案
相关题目：
【单选题】听力原文：What kind of insurance do you have? (A) We have health insurance. (B) The insurance agent is very kind. (C) Because it's necessary. (39)
A.
B.
查看完整题目与答案
【多选题】以下属于通用原始凭证的有( )。
A.
增值税发票
B.
差旅费报销单
C.
商业汇票
D.
支票
查看完整题目与答案
【简答题】According to your instructions to insurance, we have today taken ______ marine insurance ______ 50000 Yuan ______ your color TV shipment.
查看完整题目与答案
【简答题】If you have an open policy with your insurance company, we do not object _____________ covering insurance at your end.
查看完整题目与答案
【单选题】Since you desire to have your shipment effected insurance against TPND we can arrange such insurance ___________.
A.
on your account
B.
on your cost
C.
at your cost
D.
at your account
查看完整题目与答案
【多选题】以下属于原始凭证的有( )
A.
工资结算汇总表
B.
现金支票存根
C.
通用记账凭证
D.
汇总原始凭证
查看完整题目与答案
【单选题】Your life insurance should be enough to ____any funeral costs as well as debts that you may have accumulated.
A.
adopt
B.
hold
C.
cover
D.
load
查看完整题目与答案
【多选题】以下所列属于原始凭证的有 ( ) 。
A.
入库单
B.
经济合同
C.
增值税专用发票
D.
增值税普通发票
查看完整题目与答案
【简答题】______ your information, we have taken out an open policy ______ the Lloyd Insurance Company, London.
查看完整题目与答案
【单选题】For your information, we have ______ an open policy with the Lloyd Insurance Company, London.
A.
made out            
B.
turned out
C.
worked out            
D.
taken out
查看完整题目与答案
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