單項(xiàng)選擇題Halon extinguishes a fire by().

A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fule with a nonflammable surface


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1.單項(xiàng)選擇題Halon extinguishes fire primarily by().

A.cooling
B.smothering
C.shielding of radiant heat
D.breaking the chain reaction

2.單項(xiàng)選擇題Halon gas will decompose and may form very hazardous toxic fumes when discharged().

A.directly on flames
B.at room temperature
C.in an extremely cold climate
D.None of the above

3.單項(xiàng)選擇題Hand hold or straps on the underside of an inflatable are provided().

A.to right the raft if it capsizes
B.to carry the raft around on deck
C.for crewmen to hang on to
D.to hang the raft for drying

4.單項(xiàng)選擇題He is()a carpenter as a chief officer.

A.more
B.not so much
C.rather
D.not shch

5.單項(xiàng)選擇題Herringbone is a term associated with().

A.anchoring
B.mooring
C.sewing
D.splicing