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exit concentration造句

"exit concentration"是什么意思  
造句與例句手機版
  • After cleaning, the ventilation exit concentration of sodium aerosol is below to 0.5mg / l
    氣溶膠經(jīng)過凈化后,通風(fēng)系統(tǒng)的出口氣溶膠濃度小于05mgl。
  • It's difficult to see exit concentration in a sentence. 用exit concentration造句挺難的
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