一般选用()型的支承钉对已加工面定位。A.平头 B.球面 C.齿纹面

题型:单项选择题

问题:

一般选用()型的支承钉对已加工面定位。

A.平头

B.球面

C.齿纹面

考点:磨工考试初级磨工初级磨工题库
题型:单项选择题

Many people love going on a trip by plane , but an airport is usually far from the city . You have to arrive there and wait for hours for the plane to take off and it is often late . You can't open the window .You can't choose the food .Planes are fast ,but it takes hours to get out of the airport and into the city .

I like travelling by train .I think trains are safe . Train stations are usually in cities . when you are late for a train , you can catch another one . You can walk around in the train and open the windows . You can see many interesing things on your way . I know it takes a little more time .

I also like cars . You can start your trip when you want to . and you don't need to get to a station . You can carry many things with you too . But sometimes there are many cars on the road .

小题1:Many people like travelling by plane because ___.

A.it is slow

B.you can open the window

C.it is fast

D.the airport is fay from the city小题2:What does "take off " mean ?

A.达到

B.起飞

C.降落

D.脱掉小题3:If you want to take many things with you , you would like to take ___

A.a bus

B.a train

C.a plane

D.a car小题4:What is the disadvantge of the car ?

A.You needn't go to the station .

B.You can start your trip when you want to .

C.There are too many cars on the road .

D.You can see many interesting things .小题5:which sentence about the writer is TRUE?

A.He likes taking a plane because it takes a lot of time to go to the city .

B.He likes taking a train because train stations are usually in cities .

C.He likes taking a bus because he can drive it .

D.He likes taking a plane because it is fast .

题型:单项选择题

有化合价升降的反应是氧化还原反应。下列一定不是氧化还原反应的是(  )

A.化合反应

B.分解反应

C.置换反应

D.复分解反应

题型:单项选择题

(5/16)in等于7.94mm。( )

题型:单项选择题

一般来说,对方发直线球时,手臂多由后用力()

A.向上

B.向前

C.向下

题型:单项选择题

简述吸收-解离实验。

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