air-entraining agent短语¹⁴⁴⁹⁷²⁺² 基本例句 带气剂 What we indicate air content of concrete and exert maximum efficacy of air-entraining/span> agent parameter is always a question to need in using air-entraining agent. 正确表征混凝土含气量，发挥引气剂掺量的最大功效，一直是引气剂使用过程中需要解决的问题。 chemyq