28. Matches, sulfur and red phosphorus are _________.

A. Explosives

B. Inflammable solid materials

C. Self-igniting articles

D. Oxidizing materials

Answer：B

Previous question: 27. Gun powder, explosives and detonating powder belong to which of the following dangerous chemicals?

Next question: 29. Which of the following is an inflammable solid material?

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 meaning of this sign?
When rescuing a wounded person suffering spinal fracture, it is necessary to ___________.
When a motor vehicle temporarily stops at night, which lamp should be turned on?
What is the meaning of this sign?
What is the meaning of this sign?
When rescuing a person sustaining full-body burns the rescue personnel may spray cool water to his body to put out the fire.
When an erosive material catches fire, it should not be put out with water cannon.
When approaching another vehicle at night, why should the driver alternate between high-and-low-beam at a distance more than 150 meters?
What is the meaning of this sign?
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.
When rescuing a wounded person suffering from bone fracture, which of the following should be kept in mind?
How to ensure safe driving at night?
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 there is bleeding at the bone fracture of a wounded person, the first thing to do is to keep it in position before stopping the bleeding and dress the wound.
What is the meaning of this sign?