短語(yǔ)詞組短語(yǔ)Pull Back Power ring 倒後擦發(fā)條BACK UP RING KIT 備份環(huán)套件;備份圓環(huán)套件back support ring 後支承環(huán)Back up ring 支承環(huán)back sealing ring 後密封環(huán)back moving ring 廻位彈簧back locating ring 後定位環(huán)back contact ring 靜接點(diǎn)彈簧 返回 back ring