单项选择题
A.controls the amount of gasoline to the engine B.shuts off the gasoline supply at the tank C.is used if the gasoline tank leaks D.All of the above
The primary hazard of liquefied petroleum gas and lique...
单项选择题The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.
A.pressure B.toxicity C.temperature D.flammability
The amount of LFG that may be loaded into a given tank ...
单项选择题The amount of LFG that may be loaded into a given tank is determined by（）.
A.checking the loading sheet B.loading to within 1 percent of outage C.loading to within 10 percent of the safety relief valve setting D.filling to the maximum level indicated on the liquid level gaging device
The airborne concentrations of substances (such as H2S)...
单项选择题The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.
A.exposure limits B.concentration limits C.threshold limit values D.substance limit values
