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、A.fuel
B、B.oxygen
C、C.ignition
D、D.All of the above
A、A.fuel
B、B.oxygen
C、C.ignition
D、D.All of the above
A、furnace to be re-purged B、electric charge to buildup in the igniter C、fuel pump to restart D、dram level to stabilize
A、furnace to be re-purged B、electric charge to buildup in the igniter C、fuel pump to restart D、drum level to stabilize