Question

二.多选题(共12题,共24分)
31.what are the main sources of fire for electrical fires? please choose from the following options. (2分)
□a.electrical sparks
□b. combustible gases (such as natural gas, gas, etc.)
□c.flammable liquids (eg, gasoline, kerosene, etc.)
□d.electrothermal high temperature (high temperature caused by large current in the conductor, or magnetic loss in the electromagnetic mat
erial, or electrical loss in the insulating medium)
□e.electric heaters (such as electric stoves, fast heat, etc.)
□f. open flames (such as burning coal stoves, wood, etc.)

Explanation:

Electrical sparks (A) can ignite flammable materials. Electrothermal high temperature (D) due to electrical - related causes (like large current in conductor, magnetic or electrical losses) can start a fire. Electric heaters (E) which are electrical appliances can be a source of electrical fire if misused or malfunctioning. Combustible gases (B), flammable liquids (C) and open flames (F) are not electrical - related sources of fire.

Answer:

A. Electrical sparks, D. Electrothermal high temperature (high temperature caused by large current in the conductor, or magnetic loss in the electromagnetic mat erial, or electrical loss in the insulating medium), E. Electric heaters (such as electric stoves, fast heat, etc.)