问题
单项选择题 A1型题
提取鞣质时，使用最普遍的溶剂是（）
A.甲醇
B.乙醚
C.乙酸乙酯
D.乙醇
E.50%～70％含水丙酮
答案
参考答案：E
搜题请搜索小程序“爱下问搜题”
提取鞣质时，使用最普遍的溶剂是（）
A.甲醇
B.乙醚
C.乙酸乙酯
D.乙醇
E.50%～70％含水丙酮
参考答案：E
Questions 23-30
· You will hear people from the National Food Council complaining to retailers about the high prices they are charging for food products and household goods. They complain that the shops have marked up wholesale prices far too much.
· For each question (23-30), mark one letter (A, B or C) for the correct answer.
· After you have listened once, replay the recording.
Extra land has been bought in order to
A．
| A. provide good car parks. |
B．
| B. show a large range of goods. |
C．
| C. help farmers to grow more food. |