单选题Fusible-link fire dampers are operated by（）.A8the heat of a fire melting the linkBa break-glass and pull-cable systemCelectrical controls on the bridgeDa mechanical arm outside the vent duct
单选题
Fusible-link fire dampers are operated by（）.
A
8the heat of a fire melting the link
B
a break-glass and pull-cable system
C
electrical controls on the bridge
D
a mechanical arm outside the vent duct
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