Insert the following words in the text

 

 

in (x2), with (x2), of (x6), for (x2), over, to, by, on

 

 

special, specially, best, easily, unsuitable, available

 

 

The materials __ class A fires are __ extinguished __ water. The range __ equipment __ __ attack allows the successful extinguishment __ almost any size __ fire __ the minimum amount __ damage.

 

Dry powders are also effective but unless there are special considerations such as rapid – spreading surface fire they are messy and expensive and have no advantage __ water.

 

Carbon dioxide is not __ suited __ class A fires and __ the absence __ special hazards it should not be generally used. However, there are __ cases where total flooding systems are used to protect valuable goods which could be ___ damaged __ water.

 

Foam and vaporizing liquids are __ __ use __ this type __ fire and should not be used.

 

50

Translate the sentences. Determine the function of the infinitive.

 

1. The earliest organic halogen compound to be used as a chemical extinguisher was carbon tetrachloride (СТС).

 

2. To use pumps to their maximum efficiency the firefighter must have basic knowledge of hydraulics.

 

3. What helped them reduce the hazard of the ignition source which couldn’t be removed from the dangerous area for a long time, was the inert gas.

 

4. It is necessary for an optimum vaporizing liquid extinguisher to have maximum combustion interference.

 

5. The combustion leading to flame propagation is known to be a chain reaction.

 

6. To extinguish a fire it is sufficient to reduce the oxygen content below the level that will support combustion.

 

7. Before extinguishing a fire firefighters should try to decide which agent to use.

 

8. It is easier to prevent a fire than to extinguish it.

9. To reduce the oxygen content some inert gases should be used.

 

10. Every hazard needs to be considered separately.