问题
单项选择题
Automatic fire dampers in ventilation systems are operated by a（）.
A.remote operated valve
B.fusible link
C.CO2 system pressure switch
D.heat or smoke detector
答案
参考答案：B
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Automatic fire dampers in ventilation systems are operated by a（）.
A.remote operated valve
B.fusible link
C.CO2 system pressure switch
D.heat or smoke detector
参考答案：B