40. At the scene of a traffic accident, once there is a leakage of toxic and harmful substances, people must be evacuated at the first time and alarmed immediately.

Answer：Y

Previous question: 39. The wrong method to rescue a poisoned person in a traffic accident is to ______.

Next question: 41. When rescuers enter the scene to rescue the wounded after harmful gas leakage caused by traffic accidents, they must wear air respirators or cover their mouth and nose with wet towels.

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 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 there is no bandage for rescuing a wounded person, which of the following measures is wrong?
What should the driver do when he/she encounters an oncoming ambulance in the same lane?
What is the meaning of this sign?
What is the meaning of this sign?
In emergencies, people¡¯s life safety should always be put in the first place.
When rescuing the persons who are losing blood, it is necessary to ______ first.
When rescuing the injured, it is necessary to ________.
When rescuing a person sustaining full-body burns the rescue personnel may spray cool water to his body to put out the fire.
What is the meaning of this sign?
When approaching a vehicle on a narrow slope, which one of the following ways is correct?
What is the meaning of this sign?
What is the meaning of this sign?
What is the meaning of this sign?
When encountering an obstacle on one side of the road, what should vehicles do as they approach each other?
When following other vehicles on the uphill section of a mountain road, what should the driver do if the vehicle in front stops?