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问题 单项选择题 A1型题

当载气线速较小，VanDeemter方程中的分子扩散项起控制作用时，采用下列哪种气体作载气有利于提高柱效（）

A.H2

B.N2

C.Ar

D.He

答案

参考答案：C

改错题
短文改错。
     Of all my teachers, Mr. Moore is the one who impress me                    
most. He is 34, so he looks young for his age. And he's one of              
the most popular teacher in our school. Mr. Moore pays more               
attention to his way of teaching, comparing with other teachers.          
He tries different ways to make his classes actively and lively.          
In his opinion ,we should not only know "what", and understand            
"why". So instead giving us answers immediately, he encourages us        
to think by myself whenever he puts forward questions. With his help,    
we've learned from how to settle problems. He leads us to such a       
wonderful world of "why" as we all admire and respect him.                		1________
2________
3________
4________
5________                            
6________
7________
8________
9________
10________
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单项选择题

阅读以下材料，完成下题：

某公司的可转换债券的转换平价是40元，股票的基准价格是30元，该债券的市场价格为900元。

该债券的转换升水比率（）。

A.44.86%

B.52.36%

C.33.33%

D.44.35%
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