equivalent coefficient of friction 当量摩擦系数 ; 当量磨擦系数
equivalent friction angle 综合内摩擦角
Equivalent Friction Factor 折合沿程阻力系数
equivalent angle of internal friction 等效内摩擦角 ; 岩体等效内摩擦角
equivalent of internal friction angle 等代内摩擦角
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There is something that is the equivalent of friction inside electric wire.
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