题目内容

起重机使用过程中，突遇火灾的处置方法。 1、用干粉或二氧化碳灭火机灭火 2、拉下闸刀开关切断电源

A. 3-2-1-4
B. 2-3-4-1
C. 4-1-2-3
D. 1-2-4-3

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- I hear you got through your exam. Congratulations!
- _________
A：No. I didn't do well enough.
B：Who told you that？
C：Thanks.
D：Yes, I got a good mark.

- I hope you have a most happy and prosperous new year!
- _________
A：You are welcome!
B：How smart you are!
C：The same to you!
D：Nice going!

- Can you help me？
- _________
A：No, I don't know.
B：Sure. What is it？
C：Don't mention it.
D：That's it.

如图所示，该图箭头指向部件名称是什么？()

A. 小车被动车轮
B. 小车主动车轮