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【单选题】
考虑到盐的水解, 配制下列盐溶液,不需要将盐先溶于浓盐酸的是( )。A.
FeCl 3
B.
NaCl
C.
SnCl 2
D.
AlCl 3
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皮皮学刷刷变学霸
举一反三
【单选题】在撰写综述论文的过程中，阅读文献要达到的目的有（）
A.
充分了解学术界在此专题的发展情况基
B.
在短期内完成初稿
C.
了解与该题目有关的一些材料，为撰写综述打下基础
D.
在阅读过程中，了解他人的写法，给自己写综述提供参考
【单选题】下列使用pH试纸的方法正确的是( )
A.
将溶液倒在pH试纸上测定溶液的pH
B.
将pH试纸伸入溶液中测定溶液的pH
C.
测定前必须先用蒸馏水润湿pH试纸
D.
用胶头滴管滴1小滴待测液到pH试纸上测定溶液的pH
【简答题】企业对外发生经营业务收取款项时，应（ ）开具发票。
【单选题】What is this news mainly about?
A.
The change in the policy of insurance.
B.
The independent insurance agency market.
C.
The development of an insurance company.
D.
The worries of an insurance customer.
【单选题】What is this text mainly about?
A.
The life of people with I. Q. 's below 90.
B.
The life of people with the highest I. Q.
C.
The reason why people have different I. Q. levels.
D.
People with different I. Q. levels and the confliction among them.
【单选题】This passage is divided into three parts. Para 1 is Part I. What is the main idea for this part?
A.
the reason why the young man wanted to find a job
B.
the most important reason why he refused the job
C.
his disappointing experience to find the job
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