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
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