RD2和RD3车轴轴颈直径均为（）mm。A、100 B、120 C、130 D、15_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

RD2和RD3车轴轴颈直径均为（）mm。

A、100

B、120

C、130

D、150

答案

参考答案：C

选择题

How are you getting on with your work?

—I can’t do it any longer. I’ll have to get help.

A．carefully

B．quietly

C．alone

D．hard

补全对话，情景问答

情景交际。

1. Is he your uncle?
2. Are those your brothers and sisters?
3. Is she your mother?
4. Is this boy your friend?
5. Is his grandfather Mr Brown?

A. Yes, he is my friend.
B. No, it's Mr Green.
C. No, he is my father.
D. Yes, she is.
E. No, they're my friends.