下列哪两种物质在浓硫酸作用下能发生酯化反应()。
A、乙醇
B、乙醚
C、乙醛
D、乙酸
参考答案:A, D
根据首字母或汉语提示完成单词。
1. The play will be ____________ (演出) at the City Theatre.
2. She is a ________ (成员) of a tennis club.
3. The p________ situation is peaceful, but in the past there was trouble in this area.
4. We have plenty of ________ (本地的) stores to choose from.
5. The girl's got her ears pierced, but she doesn't wear e________.
静脉注射用混悬液中99%以上的微粒粒度应在()以下。