angle of external friction 外磨擦角
coefficient of external friction 外摩擦系数
soil coefficient of external friction 土壤外部摩擦系数
Another is caused by internal friction in soil and external friction between soil and track-plate face.
其二为由土壤内摩擦力及土壤对履带板的外摩擦力所产生的推进力。
In contrast, locking plates follow the biomechanical principle of external fixators and do not require friction between the plate and bone.
与之相比，锁定钢板外固定架的生物力学原则相仿，无需钢板与骨之间的摩擦力。
The results show that the shock standoff distance, skin friction coefficient and surface heat flux all increase with the strengthening of the external dipole magnetic field.
计算结果表明，外加偶极子磁场使激波脱体距离增加，壁面摩擦系数和表面热流密度增大。
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