短语词组短语bow w spring centralizer 弓形弹簧扶正器bow -tupe spring 叠板弹簧bow w spring 弓形弹簧Bow -spring casing centralizers 弓形弹簧套管扶正器bow spring casing centralizer 弓形弹簧套管扶正器forward bow spring 前艏缆after bow spring 前倒缆;首倒缆 返回 bow spring