突然断风的主要危险在于（）。
A、引起渣铁倒灌，堵死风口。
B、造成渣铁在炉内排放不净。
C、煤气向送风系统倒灌，造成爆炸。
参考答案：A, C
根据句意及首字母，填入适当的单词。
1. She often b______ her sister on Sundays.
2. What's she doing for v______?
3. I'm going c______ with my parents.
4. They're r______ at home this weekend.
5. Tom is playing football n______ week.
机动车的稳定性是指车辆抵抗（）
A、侧滑
B、倾翻
C、轮胎气压
