单项选择题
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
Except in rare cases，it is impossible to extinguish a s...
单项选择题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
Control valves of a CO2 system may be located within th...
单项选择题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
CO2 cylinders，which protect the small space in which th...
单项选择题CO2 cylinders，which protect the small space in which they are stored must（）.
A.NOT contain more than 200 pounds of CO2 B.be automatically operated by a heat actuator C.have an audible alarm D.All of the above
