问题
选择题
下列各项表达中正确的是( )
A.一CH3(甲基)的电子式为
B.乙炔的结构简式:CHCH
C.乙烷的结构简式CH3CH3
D.聚丙烯的结构简式:
答案
答案:C
下列各项表达中正确的是( )
A.一CH3(甲基)的电子式为
B.乙炔的结构简式:CHCH
C.乙烷的结构简式CH3CH3
D.聚丙烯的结构简式:
答案:C
阅读下面对话,从方框内7个选项中选择5个恰当的句子完成此对话,并将其标号填入题前括号内。 | |
B: Yes, and you are…? A: 2. This is my membership card. Would you please show me your passport? (护照) B: OK. 3. A: Welcome to Beijing, Miss White. I am so glad that you are the first guest I have received. B: Thank you, Miss Chen. 4. A: Let me help you with your suitcase. Our car is waiting for us just at the entrance. 5. B: Thank you very much for your good service. A: You're welcome. |