單項(xiàng)選擇題The tops of vents from gasoline tanks should terminate().

A.in open air
B.inside cabins
C.in machinery space
D.underwater


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2.單項(xiàng)選擇題The shut off valve at the gasoline tank which can be operated from outside the tank space ().

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

3.單項(xiàng)選擇題The primary hazard of liquefied petroleum gas and liquefied natural gas is().

A.pressure
B.toxicity
C.temperature
D.flammability

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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