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31. When an erosive material catches fire, it should not be put out with water cannon.
Answer：Y
Previous question: 30. Once inflammable gas causes a fire disaster, it should be put out with water in good time.
Next question: 32. Dangerous chemicals possess the characteristics of explosion, inflammation, poison, erosion and radiation.
2026年摩托车科目四英文版题库共345题，你可以免费查看前50题，完整版题库请添加微信购买：
The English version of the 2026 motorcycle subject 4 question bank has a total of 345 questions. You can view the top 50 questions for free. Please add WeChat to purchase the complete version of the question bank.
科目四试题
- What is the meaning of this sign?
- What is the meaning of this sign?
- When carrying the wounded persons in coma or in danger of suffocation, they should lie face up.
- When using splints, sticks or tree branches to keep the unexposed bones in position, it is necessary that these things should exceed the upper and lower joints of the wound.
- What is the meaning of this sign?
- When a motor vehicle stops in snow, which lamp should be turned on?
- When a motor vehicle stops temporarily in a rainy day,which lamp should be turned on?
- When the tire pressure is too low, what can happen when driving at a high speed?
- Which one of the following measures is correct when a motor vehicle intends to overtake but the vehicle infront refuses to yield?
- What is the meaning of this sign?
- The drivers, loaders and supercargoes responsible for dangerous chemicals transportation should all full understand the chemical characteristics, potential risks, features of the packaging containers and emergency measures for any unexpected accidents.
- Dangerous chemicals possess the characteristics of explosion, inflammation, poison, erosion and radiation.
- How should lamps be used when motor vehicle drivers pass through a two-way tunnel?
- When approaching a vehicle on a narrow slope, which one of the following ways is correct?
- What kind of harmful effect will be brought about by continuously using the foot brake on a long downhill road?
- What is the meaning of this sign?