Fusible-link fire dampers are operated by（）.

A . use different fire hose pressures B . use fire hoses of different sizes C . not attack the fire from opposite sides D . not wear protective clothing

A . eliminate slippage B . provide excitation C . provide starting torque D . increase efficiency

A . convection B . conduction C . radiation D . direct contact

A . Burning oil B . Electrical C . Paint D . All of the above

A . solid materials such as wood or bales of fiber B . flammable liquids C . electrical equipment D . metallic solid

A . Fires in electrical equipment B . Flammable oils and greases C . Class A fires in ordinary combustibles D . Materials containing their own oxyge

A . solid materials such as wood or bales of fiber B . inflammable liquids C . electrical equipment D . metallic solid

A . Class A B . Class B C . Class C D . Class D

A . convection B . conduction C . radiation D . direct contact

A . Class A B . Class B C . Class C D . Class D

A . put the wind off either beam B . head the bow into the wind and decrease speed C . put the stern into the wind and increase speed D . put the stern into the wind and decrease speed

A . a break-glass and pull-cable system B . electrical controls on the bridge C . a mechanical arm outside the vent duct D . the heat of a fire melting the link

A . camshaft B . flywheel C . crankshaft D . thrust shaft

A . A fusible link will automatically open after a fire is extinguished and reset the damper B . Fusible links must be replaced at every inspection for certification C . Fusible links are tested by applying a source of heat to them D . Fusible links must be replaced if a damper is activated

A . 正确 B . 错误

A . Class A B . Class B C . Class C D . Class D

A . remote operated valve B . fusible link C . CO system pressure switch D . heat or smoke detector

A . Class A B . Class B C . Class C D . Class D

A . a mattress B . spilled liquids such as oil or paint C . high voltage electrical gear D . a trash ca

A . a mattress B . spilled liquids such as oil or paint C . high voltage electrical gear D . a trash ca