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

What is the most frequent problem for driving on a muddy road?
When two vehicles approach each other on a foggy day, what is the best method of safe driving?
What is the meaning of this sign?
When driving on road sections where safe sight distance is affected, such as the top of a ramp, what should drivers do to ensure safety?
When rescuing the injured, it is necessary to ________.
What is the meaning of this sign?
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?
When there is no bandage for rescuing a wounded person, which of the following measures is wrong?
When carrying the wounded persons in coma or in danger of suffocation, they should lie face up.
When a motor vehicle temporarily stops in fog, which lamp should be turned on?
When a motor vehicle encounters an accident, the driver should pay attention to whether there is fuel leakage, pipeline rupture, so as avoid accidents.
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.
What is the meaning of this sign?
What is the meaning of this sign?
What is the meaning of this sign?