单项选择题

Backfire flame arrestors are installed on（）.

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

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单项选择题

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

单项选择题

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

单项选择题

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