单项选择题

If the diesel fuel vapors present are within the flammable range （）.

A.the vapor air mixture is too rich to burn
B.an explosion may occur if a source of ignition is present
C.the vapor air mixture is too lean to bum the upper explosive
D.limit has been exceeded

相关考题

Before attempting to put out a class “C” fire involving...

单项选择题Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.

A.insulate your shoes
B.ground the fire hose
C.secure its power supply
D.start the fire pump

While working in the engine room, you hear seven short ...

单项选择题While working in the engine room, you hear seven short blasts followed by one long blast on the ships whistle, supplemented by the same signal on the general alarm bellsYou should （）.

A.start the fire pump to charge the fire main
B.standby the main console and await orders from the engineer on watch
C.go to your fire station
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单项选择题All personnel should be familiar with the lifeboats （）

A.boarding and operating procedures
B.maintenance schedule
C.navigational systems
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船舶电气与船舶安全

If the diesel fuel vapors present are within the flammable range （）.