单项选择题

The atmosphere in a tank is too lean if it is（）.

A.incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)
B.capable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)
C.capable of supporting a fire once started
D.not safe for ballasting

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The all-purpose nozzle will produce a fog spray when you（）.

A.pull the nozzle handle all the way back toward the operator
B.pull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzle
C.push the nozzle handle forward as far as it will go
D.insert a fog applicator between the fire hose and nozzle

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Small quantities of flammable liquids needed at a work site should be（）.

A.used only under the supervision and direction of a ship's officer
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C.used only when a pressurized fire hose is laid out ready for immediate use
D.in a metal container with a tight cap

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Since the fire is increasing on board the vessel，the Captain orders that the ship be（）.

A.subtle
B.dental
C.brittle
D.scuttled

T﻿he atmosphere in a tank is too lean if it is（）.

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The atmosphere in a tank is too lean if it is（）.