A、The temperature of the substance must be equal to or above its fire point
B、The air must contain oxygen in sufficient quantity
C、The mixture of vapors with air must be within the explosive range
D、All of the above
更多“Which condition is necessary for a substance to burn?（）”相关的问题
A、The mixture is too lean to burn B、The mixture is too rich to burn C、The vapor is about to explode D、Conditions are perfect for combustion
A、controlled variable B、manipulated variable C、set point D、control point
A、existing visibility conditions，limited only by the curvature of the Earth B、perfect visibility conditions，limited only by the curvature of the Earth C、existing visibility conditions，limited only by the intensity of the light D、perfect visibility conditions，limited only by interference from background lighting
A、Viscosity is decreased B、Octane number is altered C、Pump speed is decreased D、Blower’s speed is decreased
A、It is a sailing maneuver which brings the vessel's head through the wind B、It connects the boom to the mast and allows the boom to swing freely C、It is a sailing condition where there is a loss of air flow over the sails D、None of the above
A、The IBGP neighbor is not directly connected. B、BGP synchronization is enabled in a transit autonomous system with fully - meshed IBGP neighbors. C、The EBGP neighbor ebgp - multihop option is set to the de fault value. D、The BGP update interval is different between the two BGP neighbors. E、The BGP neighbor is referencing an incorrect autonomous system number in its neighbor statement. F、There is an access list blocking all TCP traffic between the two BGP neighbors.
A、airport B、airfield C、airline D、air-conditioned
A、small plate which fills the aperture between riveted strakes and the vessel framing B、backing plate which is used to level the strakes while riveting，and then removed C、internal frame to which the side shell is riveted D、seam that is welded after riveting is completed
A、small plate which fills the aperture between riveted strakes and the vessel framing B、backing plate which is used to level the strakes while riveting，and then removed C、internal frame to which the side shell is riveted D、seam that is welded after riveting is completed
A、Lube oil is diluted and its viscosity is reduced B、Sulfuric acid is formed C、Bearings become pitted ad immediately fail D、Valve stems develop sludge deposits
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