( ) Does not fall under fall protection.

When the height of the high work is ( ) m, it is called the level 2 high work.

For ( ) (including) above high work, the "high work permit" should be applied.

High work means work performed above the fall height datum ( ) (inclusive), where there is a possibility of falling.

When doing hot fire analysis, the interval between sampling and hot fire is more than ( ) minutes, or the stop time in the middle of hot work is more than ( ) minutes, you must resamb for analysis.

For hot operation in the no-fire zone, the distance between the oxygen cylinder and the acetylene cylinder is at least ( ) meters.

A gas explosiometer measures the ( ) of combustible gases.

When the chemical equipment is hot repair, the medium that can not be directly used to replace the combustible gas is ( ).

Conforms to the way energy is isolated or controlled the following are not included ( ).

The operator who pumps the blind plate shall carry out ( ) and implement the safety technical measures.

There are many unsafe factors in petrochemical production, among which flammable, explosive, toxic and ( ) substances are one of the main unsafe factors.

Install and remove blind plate should be operated according to the blind plate drawing, and the personnel arrangement should be ( ).

After gas detection in confined space ( ) minutes, the operation has not started and should be tested again.

The following production areas are restricted Spaces ( ).

The lighting and electrical requirements for working in confined Spaces are ( ).