per unit length短语⁶¹⁵⁷¹ 基本例句 单位长度 The relationship between solid loading ratio and pressure drop per unit length is obtained. 通过大量实验，得出固气比与总压降的关系。 cnki Through test and analysis the relations of fabric property with weight per unit length and punching density are concluded. 经实验验证及理论分析得出了产品定量、针刺密度与非织造布性能的关系。 chemyq