????????????????????,????????,???????,????????,?????????????,???????????
??1.??:???????????????????????,????????,???????????????????,??????????????????,?????????????????
??2.??:????,???????????PVC?
??3.????:???????????????????????????,???????,??????????????????????
??????,????????,???????????????,????????????????,???????,?????????,???????????????
????,???????,???????????????????wd40???????,???????????????,??????:
??1.???????????;
??2.?????;
??3.???????????,??????????,???,???????,?????????????,????????
??4.????,?????,????????,??????wd40??????
??5.???????wd40,?????,??????????
??6.??????????,???????,????????????,????????????,?????????????
??7.?????????????
??8.????????????,?????????,?????????,???????,????????????,?????????,?????????,?????,???????,??????
