【单选题】
Every station platform is 1_________ (配备)with several assistance stations for emergency use. These cabinets include a direct 2__________ (电话)to the metro control center, a switch allowing the current to the 3__________ (轨道) to be cut off, and a fire extinguisher. They are identified with the blue hand signal, as well as by special blue lighting in some 4__________ . Several stations also have direct assistance telephones installed elsewhere in the station, such as in far-flung accesses and automatic entries. All station platforms are equipped with 5_______________ (灭火设备)cabinets at the end of the platforms. These contain a fire hose and a 6__________(开关)allowing power to the tracks to be cut off.
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