用中心架支承工件车内孔时，如出现内孔倒锥现象，则是由于中心架_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

用中心架支承工件车内孔时，如出现内孔倒锥现象，则是由于中心架偏向( )所造成的。

A．操作者一方

B．操作者对方

C．尾座

D．前座

答案

参考答案：A

补全对话，情景问答

给下列的问句选择适当的答语。

( ) 1. Can I wear my T-shirt?
( ) 2. What's the weather like today?
( ) 3. What are you doing?
( ) 4. How much is the dress?
( ) 5. Are they donkeys?
( ) 6. Can I help you?
( ) 7. How much are they?
( ) 8. What time is it?

A. I'm reading a book.
B. Thirty-five yuan.
C. Yes, please. I want a pair of sneakers.
D. Yes, you can.
E. It's cloudy today.
F. No, they aren't.
G. It's six o'clock.
H. They're fifteen yuan.

单项选择题

证券公司证券自营业务原始凭证以及有关业务文件、资料、账册、报表和其他必要的材料应至少妥善保存（）年。

A.7

B.10

C.15

D.20