單項(xiàng)選擇題

When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.

A.aimed at the source of the flames
B.fogged above the equipment
C.shot off a flat surface onto the flames
D.used to shield against electrical shock

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單項(xiàng)選擇題

When dry chemical extinguishers are used to put out class B fires，there is a danger of reflash because dry chemical（）.

A.is not an effective agent on Class B fires
B.does little or no cooling
C.dissipates quickly
D.is rapidly absorbed by the liquid

單項(xiàng)選擇題

A shipboard Oil Pollution Emergency Plan is required of（）.

A.all vessels，regardless of size and commercial application
B.any barge or ship constructed or operated in such a manner that no oil in any form can be carried aboard
C.an oil tanker of 150 gross tons and above，or other ship of 400 gross tons and above
D.an oil tanker of 400 gross tons and above，or other ships of 150 gross tons and above

When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.

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When dry chemical extinguishers are used to put out class B fires，there is a danger of reflash because dry chemical（）.

A shipboard Oil Pollution Emergency Plan is required of（）.

When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.

When dry chemical extinguishers are used to put out class B fires，there is a danger of reflash because dry chemical（）.