discharge head短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 输送压头 About the calculation on the discharge head provided to gas by pump, the paper presents three kinds of calculation methods, analyzes and compares the case calculation results. 在计算泵提供给气体的扬程时给出了三种算法，并对实例计算结果进行了分析比较。 cnki