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问题 单项选择题

T形槽铣刀铣削时，由于（）切削热量不易散发，甚至发生退火，使铣刀失去切削能力而折断。

A.受到过大的冲击力

B.切削用量较大

C.排屑困难

D.同时铣削四个平面

答案

参考答案：C

改错题

短文改错 (共10分,每小题1分,满分10分)

One day I happened to find a chatting room in                  1——    

my QQ，there people were chatting in English．I tried            2——

to chat with some of them．T0 my surprised，I found              3——     

the oral English of some junior students were better                4——

than me．I asked them for advice and they told me                5——  

to practise more on QQ. But every day after that I                 6——

would spend one hour practise my oral English on QQ．           7——    

Day by day I learned from many useful words and               8——      

expressions．With time went by．I found that I could             9——              

even communicate some college students freely．               10_____ 
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单项选择题

（）

A.选项A

B.选项B

C.选项C

D.选项D
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