单项选择题

A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.

A.damage from crane operations
B.being used for wash down purposes
C.accidental diversion of flow to wrong location
D.freezing

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单项选择题
A combustible gas indicator meter is calibrated to read the percentage of（）.

A.vapor to oxygen
B.the flammable limit concentration
C.the autoignition concentration
D.the lower explosive limit concentration
单项选择题
A class C fire would be burning（）.

A.fuel oil
B.wood
C.celluloid
D.electrical insulation
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