大型养路机械基础制动装置是利用杠杆原理，将制动原力经杠杆和拉杆的作用扩大适当倍数后，再传给各（），产生制动作用。
A.车轴
B.车轮
C.闸瓦
参考答案：C
请根据答句写出问句。
1. A:_____________________________________?
B: No, I can't.
2. A:_____________________________________?
B: It was windy last Saturday.
3. A:_____________________________________?
B: I went to Shanghai on vacation.
4. A:_____________________________________?
B: Mr Smith works in a bank.
5. A:_____________________________________?
B: Because they are very cute.
轴承代号7312C的内径（）mm
A.12
B.24
C.42
D.60
