???, ???? ??…??·??, ??? ?? ??

????? NH????? ??? ??? ???. ????? ????? ????? ???? ???? ??? ??? ??? ???.

23? ???? ??? ????? ???? ??? ?? ??? 0.25~0.40%??? ????.

? ??? ?? ??? 0.25~0.55%???, ?? ??? ???? ??? ?? 0.25%??? ???.

???? ???? “????? ???? ??? ?? ?? ????? ?? ??? ??? ?”??? ???.

????? ???? ????? ‘?? ??? ????’ ??? ? 2.20%?? 2.00%? 0.20%??? ???? ??.

?? ????? ???? ?? ? ?? ???? ???? ??? ??? ?? ???. ?? ???? ???????? 11? ????? 0.25%??? ????.

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