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

A. Oxidizing materials

B. Inflammable solid materials

C. Explosives

D. Self-igniting articles

Answer：C

Previous question: 26. When there is bleeding at the bone fracture of a wounded person, the first thing to do is to fix the wounded part in position, then stop the bleeding and dress the wound.

Next question: 28. Matches, sulfur and red phosphorus are _________.

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

How to ensure motor vehicles have sufficient power when driving uphill?
In emergencies, people¡¯s life safety should always be put in the first place.
When an erosive material catches fire, it should not be put out with water cannon.
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 carrying the wounded persons in coma or in danger of suffocation, they should lie face up.
When rescuing a wounded person in an emergency, it is necessary to firstly stop the bleeding by compression before other methods are taken according to the conditions of bleeding.
When there is bleeding at the bone fracture of a wounded person, the first thing to do is to fix the wounded part in position, then stop the bleeding and dress the wound.
When the wounded person is suffering main artery bleeding, where should the rescue personnel press by thumb to stop the bleeding?
What is the meaning of this sign?
What is the meaning of this sign?
When rescuing a wounded person suffering from bone fracture, which of the following should be kept in mind?
What is the meaning of this sign?
Which of the following method is correct to rescue an unconscious person?
When a wounded person suffering burns is thirsty, he should only drink plain boiled water.
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.
When removing a wounded person suffering spinal fracture, the rescuer should never help the wounded person to walk. He may be carried away with a soft stretcher.