题目内容

[音频]3. Where are they going?

A. To school.
B.To the cinema.
C.To a shop
D.To a restaurant

查看答案

搜索结果不匹配？点我反馈

更多问题

[音频]4. How much does one sweater cost?

A. Twentydollars
B.Forty dollars
C.Twenty-five dollars
D.Fifty dollars

[音频]5. Where did this conversation most likely take place?

A. In a laundry.
B. In a library.
C. In an elevator.
D. In a bakery.

一分子结晶水柠檬酸主要用作清凉饮料、果汁、果酱、水果糖和罐头等食品工业中,其主要主要作用为：

A. 酸性调味剂
B. 防腐剂
C. 抗氧化剂
D. 增强食欲和促进体内钙、磷物质的消化吸收

柠檬酸可以以无水合物或者一水合物的形式存在，柠檬酸从热水中结晶时，生成（）；在冷水中结晶则生成（）