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

When a motor vehicle stops temporarily in a rainy day,which lamp should be turned on?
What is the meaning of this sign?
In emergencies, people¡¯s life safety should always be put in the first place.
Once inflammable gas causes a fire disaster, it should be put out with water in good time.
What is the meaning of this sign?
When following other vehicles on the uphill section of a mountain road, what should the driver do if the vehicle in front stops?
When a motor vehicle temporarily stops in fog, which lamp should be turned on?
What should the driver do to follow other motor vehicles on a mountain road?
Which lamp should be used when motor vehicles pass hrough an intersection at night where there is no traffic light signal?
When a wounded person is under the wheel or cargo, the wrong method is to pull the limbs of the wounded.
What is the main impact of foggy weather on safe driving?
The article that cannot be used to stop bleeding by dressing is _________.
When a motor vehicle stops in snow, which lamp should be turned on?
When putting out a fire disaster that gives out erosive steam or poisonous gas, the firefighters should wear gas masks and other related protective articles and should operate from the windward side.
What is the meaning of this sign?
What is the meaning of this sign?