短语词组短語Friction n load 摩擦負荷friction contact load 摩擦接觸力Zero Friction Load 無磨擦負載Load friction 摩擦載重;摩擦力friction tester for heavy load 重載摩擦試騐機no -load friction 無載荷摩擦Load -friction Relation 負荷 返回 friction load