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?
The article that cannot be used to stop bleeding by dressing is _________.
What should motor vehicle drivers do when parking temporarily on a rainy day?
What is the meaning of this sign?
When a wounded person suffering bone fracture in the thigh, shank and spine, it is necessary to keep the fracture in position and refrain to move the wounded person.
What is the meaning of this sign?
When a motor vehicle stops temporarily in a rainy day,which lamp should be turned on?
Dangerous chemicals possess the characteristics of explosion, inflammation, poison, erosion and radiation.
When a wounded person is under the wheel or cargo, the wrong method is to pull the limbs of the wounded.
When driving on a long downhill road, which is the best way to control driving speed?
When the tire pressure is too low, what can happen when driving at a high speed?
When a wounded person suffering burns is thirsty, he should only drink plain boiled water.
When following other vehicles on a foggy day, what should the driver do?
What is the meaning of this sign?
What is the meaning of this sign?
What needs attention when a motor vehicle drives on a road covered with ice and snow?