单项选择题
When fire pumps are used for other than firefighting service，each pipe connecting the other service (except for branch lines used for deck washing) must have a（）.
A.check valve installed in the line
B.shut off valve at a manifold near the pump
C.quick disconnect union within ten feet of the pump
D.regulator in the line set at 125 psi
相关考题
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单项选择题
When fighting an oil or gasoline fire in the bilge，which of the following should NOT be used?（）
A.Foam
B.Solid stream water nozzle
C.All-purpose nozzle
D.Carbon dioxide -
单项选择题
When fighting a fire with a portable dry chemical fire extinguisher，the stream should be directed（）.
A.over the top of the flames
B.off a bulkhead into the fire
C.in front of the fire
D.at the base of the fire -
单项选择题
When fighting a fire on a bulkhead using a portable carbon dioxide extinguisher，the stream should be directed at the（）.
A.base of the flames，moving the horn from side to side，following the flames upward as they diminish
B.top of the flaming area，moving the horn from side to side，following the flames downward as they diminish
C.center of the flaming area，moving the horn vertically from top to bottom
D.bottom of the flaming area，moving the horn vertically to the top following the flames upward as they diminish
