directional frictional effect

"长度单... ... "捻向"," direction of twist" "方向性摩擦效应"," directional frictional effect" "村妇围裙"," dirndl apron" ...

羊毛方向性摩擦效应,direc... ... ) directional frictional effect 方向性磨擦效应 ) directional friction effect 定向摩擦效应 ...