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

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 a wounded person is under the wheel or cargo, the wrong method is to pull the limbs of the wounded.
What should the driver do to follow other motor vehicles on a mountain road?
What should the driver do when he/she encounters an oncoming ambulance in the same lane?
What is the meaning of this sign?
When a motor vehicle encounters an accident, the driver should pay attention to whether there is fuel leakage, pipeline rupture, so as avoid accidents.
What is the meaning of this sign?
When driving in rain and encountering pedestrians with umbrellas or wearing raincoats, what should be done by motor vehicle drivers in order to yield?
Matches, sulfur and red phosphorus are _________.
When a motor vehicle encounters a burning phenomenon, it should leave the vehicle quickly so as not to cause injury or asphyxia to the respiratory tract.
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 approaching a vehicle on a narrow slope, which one of the following ways is correct?
What is the meaning of this sign?
When using splints, sticks or tree branches to keep the unexposed bones in position, it is necessary that these things should exceed the upper and lower joints of the wound.
What is the meaning of this sign?
What is the meaning of this sign?