??? ???? ???? ?? ?????? ????? ?????? ????? ???? ????? ?????? ???????? ???? ????? ???? ?????.

???? ?? ????? ??? ??? ???? ???????, ??? ?? ???? ?????? ?? ????? ??? ????? ??? ??????. ???? ??? ??? ????? ?????? ???? ???? ?????? ??????, ?? ????? ??? ??? ????? ????. ????? ??? ?? ??? ?????????? ?????? ??????? ?? ???? ??????. ???, ?????? ?????? ??? ?? ????? ????? ??? ??.

???? ????? ??? ???? ?????? ??????, ???? ?????? ????. ???? ?????? ????? ?? ?????? ????? ?? ???? ???, ?? ????? ????? ???? ????? ??????. ????? ?????? ????? ?? ?????? ????? ??, ??, ?????? ?? ?? ????, ??? ????? ????? ???? ??? ??? ????? ???? ??? ??? ?????? ??? ?????? ????? ???? ?????.

???? ?????? ???? ???????? ?? ????? ???, ?????? ???????: ???? ????? ????? ?? ?????: ????? ?????? ????? ????? ?????? ????? ????? ????, ????? ?? ?????? ????? ????? ???, ?????? ???? ????? ????? ??? ???? ?????.

??? ????? ????? ????? ??? PVC:

??? ?????? ????? ?????? ????? ???? ????? ?????? ????? ?????. ??????: ???? ????? ????? ????? ?????? ????? ??? ???? ??? 3, ???? ????? ??????? ????? ?????? ????? ??????? ???? ????? 4. ?????? ??????? ???? ?? ?????? ????? ??????? ????? ?????? ???? ??? ???? ????? ????? ????, ?? ?????? ?????? ?? ?????? ??????? ???? ??????. ????? ?????? ????? ??????.

??? ????? ????? ??? PVC:

??? ????? ???? ???? ?????? ????? ???. ?????? ?????? ?????? ?? ??? ???? ?? ???? ??? ??????. ?????? ?????? ????? ????, ??? ????? ???? ?????? ?????? ???? ????, ?? ??? ??? ?????????? ??? ????. ?????, ?????? ????? ???????.

??? PH ?? ????? ?????:?

???? ??? ?- pH ?? ????? ????? ??????? ???? ????, ????? ??? ????. ?? ??? ?????? ?? ?????? ?????, ?? ????? ?? ??? ?- pH ????? ???? ? 8.5.

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

??????? ?????? ?? ????? ?????? ???????? ????? ?? ????? ???. ????? ????? ?????? ?????? ?? ????? ????? ???? ??? ?????? ?? ????? ???. ????? ??? ?- pH ?? ????? ?????? ???????? ?? ????? ?? ?? ????? ??????.

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

??? ????? ????? ?? ??????? ?? ????? ????, ???? ?????? ????? ????? (?? ??????). ???? ????? ??? ?? ????, ?? ???? ???? ?????? ?? ????, ?????? ???? ????? ?????? ?? ????, ?? ??? ??? ???? ?????? ??????, ???? ?????? ??? ???? ????.

????? ???? ??? ????? ????? ?? ????? ???? ???? ???? ?? ?????, ??? ????? ????? ??. ????? ????? ????? ???????? ???? - Weihua, ????? ???????!