?? ????????«??????????????????????»
![](https://image.chezhanri.com/2019/1226/59bd3c18ddfc85a0c6d09807bc4fc05a.jpg)
????:1?????wx:???????
2??????95?98??
3?????????
4????????
5????????
???7???????????????3???? ??????“?????”????,????????????????????????,????????«??»(????«?»),??????(IEC)??,?????????????IEC?,????????????????????,?????
«???»?????????????IEC??,?????????????,??????????IEC??????,??????IEC???????????
«???????????»??????????????IEC????,????????????????IEC???????????????,???????????IEC?????«???????»??????????????????????IEC???????????????????????????/???????????????????,??/????????????????«??????????»??????????IEC????????????IEC???,?????IEC????????????«??????»?????
IEC????????????,?????????,????????54????,??????????????????????«??????????»????,????????????????????IEC???????,????,???????????????????????????? ?????????:????????