單項選擇題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


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

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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題Storage batteries should be charged in a well ventilated area because（）.

A.they generate heat
B.they emit hydrogen
C.of the toxic fumes they emit
D.they recharge faster in a well ventilated space

5.單項選擇題One of the principal dangers inherent in liquefied petroleum gas is（）.

A.as it warms up it becomes heavier than air
B.the way it reacts with sea water
C.the strong odor it produces
D.its low temperature causes frostbite or freezing