比摩阻 meaning in English

specific frictional resistance
specific frictional reststance

Discussion on two kinds of computing method for proportion friction resistant in the circular air duct
关于环形风道比摩阻两种计算方法
And it also provide other utilities , such as checking the invalid data , inquiring about friction coefficient , conversion between units , inquiring about local resistance coefficient and so on
同时，介绍了比摩阻查询，局部阻力系数查询，联机帮助等等实用功能。