Fire alarm system thermostats are actuated by（）.<br>A:smoke sensors<br>B:the difference in thermal expansion of two dissimilar metals<br>C:pressure loss due to air being heated<br>D:an electric eye which actuates when smoke interferes with the beam

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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