單項選擇題On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.

A.minimum oxygen content line
B.critical displacement line
C.critical dilution line
D.upper threshold limit


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1.單項選擇題If，during helicopter refueling operations，fuel is spilled on clothing，the person should first（）.

A.see the medic immediately
B.spray himself with foam or CO2
C.complete his task and then see the medic
D.remove the clothing and wash

2.單項選擇題Each part of the fire-main system located on an exposed deck must be（）.

A.protected against freezing
B.locked to prevent theft
C.numbered sequentially
D.pressurized at all times

3.單項選擇題Each hose in the fuel transfer system for helicopter refueling must meet the standards of the（）.

A.Federal Aviation Administration
B.Corps of Engineers
C.National Fire Protection Association
D.National Transportation Safety Board

4.單項選擇題Each hand portable fire extinguisher must be marked with（）.

A.the name of the vessel on which it is located
B.the date that it was installed
C.the names of the individuals qualified to use it
D.an identification number

5.單項選擇題Each fireman’s outfit and its spare equipment on a vessel must be stowed（）.

A.in a locked cabinet in the machinery space
B.in an unlocked cabinet in the machinery space
C.in a separate and accessible location
D.at a fire hydrant location