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
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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
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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. |