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

Which one of the following measures is correct when a motor vehicle intends to overtake but the vehicle infront refuses to yield?
What should motor vehicle drivers do when approaching an oncoming vehicle on a frozen road?
When rescuing a wounded person who has been poisoned by toxic gas, the first measure is to send him to a place where air is fresh so that he will not continue to be poisoned.
The wrong method to rescue a poisoned person in a traffic accident is to ______.
How to reduce speed or stop when driving on a road covered with snow and ice?
When rescuing a person sustaining full-body burns the rescue personnel may spray cool water to his body to put out the fire.
In emergencies, people¡¯s life safety should always be put in the first place.
What is the meaning of this sign?
What is the meaning of this sign?
When discovering animals crossing the expressway on the highway, the driver should not drastically turn to evade.
What should motor vehicle drivers do when parking temporarily on a rainy day?
What is the meaning of this sign?
Matches, sulfur and red phosphorus are _________.
When a wounded person is unable to get off the vehicle by himself, he should be removed from the vehicle so as to avoid a secondary injury.
What is the meaning of this sign?
How should lamps be used by the motor vehicle driver who follows a vehicle on a road section at night where he street light condition is good?