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【单选题】
在裂解过程中,若优先消去中性分子如 CO 2 ,则裂解前后离子所带电子奇、偶数( )A.
发生变化
B.
不变
C.
不确定
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皮皮学刷刷变学霸
举一反三
【多选题】下列各组化合物中互为同分异构体的是
A.
己烷和2,2-二甲基丁烷
B.
2,2-二甲基丁烷和2-甲基己烷
C.
2-甲基己烷和2,2-二甲基戊烷
D.
戊烷和2,2-二甲基戊烷
E.
2,2-二甲基戊烷和2,2,3-三甲基丁烷
【多选题】下列各组化合物中互为同分异构体的是()。
A.
己烷和2,2-二甲基丁烷
B.
2,2-二甲基丁烷和2-甲基己烷
C.
2-甲基己烷和2,2-二甲基戊烷
D.
戊烷和2,2-二甲基戊烷
【单选题】听力原文：W: Can you speak up a little? I'm having difficulty hearing you. M: All right. Is that better? Q: What can we conclude from the talk? (4)
A.
The woman doesn't like the man.
B.
The man tries to speak more loudly.
C.
The man doesn't want to speak up.
D.
The woman has no problem hearing the man.
【单选题】某批发企业销售甲商品,第三季度各月预计的销售量分别为1000件、1200件和1100件,企业计划每月月末商品存量为下月预计销售量的20%,下列各项预计中不正确的是( )
A.
8月份期初存货为240件
B.
8月份采购量为1180件
C.
8月份末存货为220件
D.
第三季度采购量为3300件
【单选题】Man: Can you come over for dinner tonight? Woman: I'm up to my ears in work, so I'll have to take a rain check. Question: What does the woman mean?
A.
She wants to check the weather before deciding.
B.
She has a problem with her hearing.
C.
She'd enjoy coming to dinner another time.
D.
She wants the man to help her with some work.
【单选题】下列各组化合物中互为同分异构体的是
A.
丁烷和 1- 丁烯
B.
1- 丁烯和 1-丁 炔
C.
丁炔和 1 ， 3- 丁二烯
D.
丁烯和丁炔 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
【简答题】完形填空。 'I can't believe what I'm hearing!' I thought to myself. Jeff was the last candidate (候选人) for president of Student Council. My best friend Tony came to me and said. 'I'm sorry, Mike. I really t...
【单选题】听力原文：Hello, Ms. Lee. This is Aaron Parks from Axis Corporation. I'm calling to let you know that your presentation yesterday impressed us all. We'd like you to send us a price quote for the Branden pr...
A.
A new product to be launched,
B.
An upcoming presentation.
C.
A date for completion of work.
D.
A bid for a project.
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