單項(xiàng)選擇題

Fire alarm system thermostats are actuated by（）.

A.smoke sensors
B.the difference in thermal expansion of two dissimilar metals
C.pressure loss due to air being heated
D.an electric eye which actuates when smoke interferes with the beam

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單項(xiàng)選擇題

Except in rare cases，it is impossible to extinguish a shipboard fire by（）.

A.removing the heat
B.removing the oxygen
C.removing the fuel
D.interrupting the chain reaction

單項(xiàng)選擇題

Control valves of a CO₂ system may be located within the protected space when（）.

A.it is impractical to locate them outside
B.there is also a control valve outside
C.the CO₂ cylinders are also in the space
D.an automatic heat-sensing trip is installed

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Fire alarm system thermostats are actuated by（）.

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Except in rare cases，it is impossible to extinguish a shipboard fire by（）.

Control valves of a CO2 system may be located within the protected space when（）.

Control valves of a CO₂ system may be located within the protected space when（）.