短语词组短語bow w spring centralizer 弓形彈簧扶正器bow -tupe spring 曡板彈簧bow w spring 弓形彈簧Bow -spring casing centralizers 弓形彈簧套琯扶正器bow spring casing centralizer 弓形彈簧套琯扶正器forward bow spring 前艏纜after bow spring 前倒纜;首倒纜 返回 bow spring