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

2?????????

3?????????

4????????

5?????qt??

????,????,??????,??????????,????,????,??3????????

??,???????????????????????????,??,?????????,???60?,??????????3?????

????????????????,?????????,????????????“???”,????????????????????????????“?”,??????????,?????????????????EC????????????PH???????????????????,????????????

(???? ??????? ?? ????? ???? ??????????? ????????)

?????????:?????