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.

2025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 2025 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 rescuing a wounded person who has been poisoned by toxic gas, the first measure is to send him/her to a place with fresh air so that he/she will not continue to be poisoned.
When following other vehicles on the uphill section of a mountain road, what should the driver do if the vehicle in front stops?
When approaching a vehicle on a narrow slope, which one of the following ways is correct?
How should lamps be used when a motor vehicle meets an oncoming bicycle on a narrow road or a narrow bridge at night?
What is the meaning of this sign?
Matches, sulfur and red phosphorus are _________.
What influence does smoking have upon driving?
What should be done by the driver who intends to overtake but finds that the vehicle in front is also overtaking?
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.
What should the driver do when he/she encounters an oncoming ambulance in the same lane?
When rescuing the persons who are losing blood, it is necessary to ______ first.
How should lamps be used when motor vehicle drivers pass through a two-way tunnel?
What is the meaning of this sign?
What is the meaning of this sign?
What should be checked before driving?
What is the meaning of this sign?