1. D

2. accident
According to the US Occupational safety and health admistration, an unplanned event that results in personal injury and /or property damge

3. combustile
Caple of easily igniting and rapidly burning(38*C)

4. Competent person
A person who is capable of identifying existing and predictable hazards in surroundings or in working conditions that are dangerous

5. Confined space
A work area large enough for a person to work , but arranged in such a way that an employee must physically enter the space to perform work.

6. flammable
Capable of easily igniting or rapidly burning; used to describe a fuel with a flash point below (38*C)

7. Ground fault
Incidental grounding of s conducting electrical wire

8. Hazard Communication standard
The occupational safety and health administration standard that requires contractors to educate employees about hazardous chemicals on the job site.

9. hydraulic
Powered by fluid under pressure

10. Management system
The organization of a company's managment

11. Occupational safety and health administration
An agency of the US department of labor, a law that applies to more than 111 million workers

12. Personal protective equipment
Clothing designed to prevent or reduce injuries

13. Pneumatic
Powered by air pressure, such as a pneumatic tool

14. respirator
A device that provides clean, filtered air for breathing, no matter what is in the surroundingin area.

15. Safety culture
The culture created when the whole company sees the value of a safe work enviroment

16. Safety data sheet
A document that must accompany any hazardous substances .

17. Trench
A narrow excavation made below the surface of the ground that is generally deeper than it is wide.