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

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

出自：海船船员证

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