基本解釋允許暴露極限詞組短語短語permissible concentration -short time exposure limit 時(shí)間接觸容許濃度permissible exposure limit更多詞組專業(yè)釋義琯理學(xué)允許暴露極限經(jīng)濟(jì)學(xué)允許暴露極限