单选题The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.Aexposure limitsBconcentration limitsCthreshold limit valuesDsubstance limit values
单选题
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
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