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

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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

單項(xiàng)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

The amount of LFG that may be loaded into a given tank is determined by（）.

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The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.

Storage batteries should be charged in a well ventilated area because（）.

The airborne concentrations of substances (such as H₂S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.