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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
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
- When rescuing a wounded person in coma, it is necessary to take warm-keeping measures to prevent heat loss.
- 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.
- How will the adhesive force of road change when speed increases on a damp and slippery road?
- What is the meaning of this sign?
- Matches, sulfur and red phosphorus are _________.
- Which of the following method is correct to rescue an unconscious person?
- What should the driver do when he/she encounters an oncoming ambulance in the same lane?
- The wrong method to rescue a poisoned person in a traffic accident is to ______.
- What is the meaning of this sign?
- Which of the following measures is incorrect when a motor vehicle stops?
- When the tire pressure is too low, what can happen when driving at a high speed?
- When a motor vehicle passes over an overflowing bridge, what should the driver do after stopping and observing closely?
- When the tire pressure is too low, what will happen if the tire changes its shape in waves and increases in temperature due to fast movement?
- 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?