单选题Automatic fire dampers in ventilation systems are operated by use of（）.Aremotely operated valvesBfusible linksCC02 system pressure switchesDheat or smoke detectors
单选题
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
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相关考题：
Fire dampers prevent the fire spreading through the process ofA.convectionB.conductionC.radiationD.direct contact
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单选题Convection spreads a fire by（）.Aheated gases flowing through ventilation syetemBthe transfer of heat across an unobstructed spaceCburning liquids flowing into another spaceDtransmitting the heat of a fire through the ships metal
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