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Fire alarm system thermostats are actuated by（）.

单选题
2022-09-30 21:15
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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正确答案
B
试题解析
标签： 消防演习与作业
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