题目内容

MySQL数据库中的数据不可以导出导入的文件类型是（）。

A. SQL文件
B. EXE文件
C. TXT文件
D. XML文件

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泡腾剂由酸碱系统组成，酸一般是有机酸，如（），碱为（）。

A. 盐酸、氢氧化钠
B. 柠檬酸、氢氧化钠
C. 酒石酸、碳酸氢钠
D. 醋酸、碳酸氢钠

液体制剂常用的防腐剂包括（）

A. 0.1%-0.3%苯甲酸和苯甲酸钠
B. 0.07%-0.08%山梨酸和山梨酸钾
C. 20%乙醇
D. 30%甘油

Part IIStructure (10 minutes)Section ADirections:In this section, there are 10 incomplete sentences. You are required to complete eachone by deciding on the most appropriate word or words from the 4 choices marked A),B),C) and D). Then you should mark the corresponding letter on the Answer Sheetwith a single line through the center21. Hardly had I started working on the computer _________ the electricity was gone.

A) when
B) after
C) than
D) while

Working with good colleagues to _________ you can talk everything openly will help you work efficiently.

A) who
B) that
C) whom
D) which