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In order for combustion to occur inside a piping system such as a vapor collection header in a marine emmission control system, there must be ______.
A.fuel
B.oxygen
C.ignition
D.All of the above
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fuelB
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All of the above
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单选题A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a（）.A
flame arrestorB
flame screenC
detonation arrestorD
detonation blocker
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