TWA
time-weighted average (concentration)
(産業環境大気中の有害ガスの)時間荷重平均濃度. 毎日8時間労働する場合の時間加重平均濃度.
time-weighted average (concentration); of toxic gas in industrial environments; issued by ACGIH(American Conference of Governmental Industrial Hygienists);ref. TLV(threshold limit value for chemical substa
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