單項選擇題

Backfire flame arrestors are installed on（）.

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

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單項選擇題

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

單項選擇題

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