????? ?? 45??? ?? ‘KEB ????’? ‘??? ?????’ ‘????? ?????’? ????? ?? ???? ??? ??? 30? ???. ????? ‘KEB????’? ????? ?? 0.1%? ??? ???? ????? ???? ???? ????? ?? ????? 0.3～0.5%??? ????. 30? ?? 15?? ??? ??? 4.35%, 36??? 4.68%?. 100? ? ??? ???? ??? ??? ? ?? ? 1? ? ??? ????. ‘??? ?????’? ‘????? ?????’? ? 1000? ? ??? ???? ????? 2?? 3? ??? ??? ? ??. ????? 0.9～1.1%???? ??? 30? ?? ??? 5.1～5.3%?. ‘????? ?????’? ????? ??? ? ??.