閾限值 threshold limit value (tlv): 極限值tlv =threshold limit value: 極限閾值threshold limit values: 安全限量threshold limit value-celling tlv-c: 閾限值上限值threshold limit values of weld fume: 焊接煙塵容限濃度下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯