單項(xiàng)選擇題Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.

A.immediately above the level of the oil
B.at the top of the tank
C.in the vent riser
D.one meter from the deck


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1.單項(xiàng)選擇題Backfire flame arrestors are installed on（）.

A.fuel tanks
B.spark plugs
C.carburetors
D.distributors

2.單項(xiàng)選擇題Automatic fire dampers in ventilation systems are operated by use of（）.

A.remotely operated valves
B.fusible links
C.C02 system pressure switches
D.heat or smoke detectors

3.單項(xiàng)選擇題Automatic fire dampers in ventilation systems are operated by a（）.

A.remote operated valve
B.fusible link
C.CO2 system pressure switch
D.heat or smoke detector

4.單項(xiàng)選擇題According to the T-Boat regulations the reason for providing adequate ventilation for a battery storage area is to prevent（）.

A.accumulation of carbon dioxide gas that chokes the battery
B.accumulation of explosive and toxic gases the battery can generate
C.mildew or dry rot in the battery box
D.battery failure including battery case meltdown caused by excessive heat

5.單項(xiàng)選擇題A fire starting by spontaneous combustion can be expected in which condition?（）.

A.Paints，varnish，or other liquid flammables are stowed in a dry stores locker
B.Inert cargoes such as pig iron are loaded in a wet condition
C.Oily rags are stowed in a metal pail
D.Clean mattresses are stored in contact with an electric light bulb