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


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1.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

2.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

3.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

4.單項選擇題Name one major advantage of transporting gas under refrigeration.（）

A.It increases its volume
B.It reduces its volume
C.It has less product per volume
D.None of the above

5.單項選擇題LFG tank and pipeline maintenance should include（）.

A.exclusion of all sand and solid matter
B.cleaning with clean fresh or sea water
C.examination for fractures and pitting
D.All of the above