问题
多项选择题
N-烷基化剂常用的有以下哪几类()。
A.醇类和醚类
B.卤代烷类和环氧化合物类
C.醛类、酮类和酯类
D.烯烃衍生物类
答案
参考答案:A, B, C, D
N-烷基化剂常用的有以下哪几类()。
A.醇类和醚类
B.卤代烷类和环氧化合物类
C.醛类、酮类和酯类
D.烯烃衍生物类
参考答案:A, B, C, D
The following are some advertisements(广告). Read them and answer the questions.
A. the big house in Ad. 1 B. the flat in Ad. 2 C. the town house in Ad. 3 D. the flat in Ad. 4 12. Mr. and Mrs. Black with their son, John, want to rent(租) a house with a yard for children. Which house is suitable for them? A. Mrs. Morris’ house B. Wilson’s flat C. Dana’s flat D. Nathan’s town house. 13. The flat with a parking place costs _____. A. $2,000 B. $1,200 C. $1,7000 D. $1,600 14. There are _______ kinds of houses in these four advertisements. A. two B. three C. four D. five 15. The advertisements tell us the information about some _______. A. hotels B. supermarkets C. houses D. restaurants |