单选题Fire alarm system thermostats are actuated by（）.Asmoke sensorsBthe difference in thermal expansion of two dissimilar metalsCpressure loss due to air being heatedDan electric eye which actuates when smoke interferes with the beam
单选题
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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