单项选择题

A fuel line breaks，sprays fuel on the hot exhaust manifold，and catches fire. Your FIRST action should be to（）.

A.batten down the engine room
B.start the fire pump
C.apply carbon dioxide to the fire
D.shut off the fuel supply

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单项选择题
A foam-type portable fire extinguisher would be most useful in combating a fire in（）.

A.solid materials such as wood or bales of fiber
B.flammable liquids
C.a piece of electrical equipment
D.combustible metallic solids
单项选择题
A foam-type portable fire extinguisher is most useful in fighting a fire in（）.

A.generators
B.oil drums
C.the bridge controls
D.combustible metals
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