题目内容

4.What is Li Ting going to do?

A. Return the book to Prof. White.
B. Get David to fix her computer.
C. Access her term paper from the computer.

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5.What is the last request Li Ting makes?

A. Finishing reading the book.
B. Submitting her term paper.
C. Keeping the book for another week.

以下试剂能作为基准物质的是( )

A. 优级纯的NaOH
B. 化学纯的Co2O3
C. 100℃干燥过的CaO
D. 99.99%纯锌

酸式滴定管不能直接盛装:

A. 氧化性溶液
B. 酸性溶液
C. 中性溶液
D. 碱性溶液

下列试剂可作为基准物质直接配制标准溶液的是:

A. 优级氢氧化钠
B. 优级纯浓硫酸
C. 优级纯高锰酸钾
D. 优级纯重铬酸钾