????:1??????????:??????????????

2???????150???

3?????????

4??????

5?????????200??500

???????????7??????????????3?? ?“???”??????????,????????,?????«???????????????????????????»(???????????????«????»),?????(IEC)????,???????IEC??,??????,????????

«??»????IEC?????????????????????,??????????????????,??????IEC??????????,?IEC??????????????

«??????????»????IEC?????????????????????????,????????????IEC??????????????????????,??????IEC????«????????»????IEC????????????????????/?????????????,????????????????/???????«??????»????????IEC???????????IEC??????????,???????IEC???????????????????????????«????»????

IEC????????,?????????????,????54????????????????????,??????????«????»????,???????????IEC???,?,?????????????????????????????? ???????????????:?????