短语词组短語Rack to Back Credit 背對背信用証full rack back position 齒條後退極限位置back rack 背後接線架;經紗張力調整機;後架back rack angle 縱曏角Push Back Rack 後推式貨架;後推式料架;後推貨架Push -Back Rack 後推式貨架back shading rack 反遮架;反曏電阻 返回 rack back