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? ??1
?? ??? ??? ?? ??? ???? ???? 4? ?? ????. 8??(8?28?, 0.11%)? ???? ?? ???? ???? ????. ?? 6·17??? 7·10?? ??? 8·4???? ?? ?? ? ??? 3?? ??? ??? ???? ?? ???? ?? ??? ?? ?? ????? ??? ? ??? ???. ?? ????? ???? ????? ???? ????. ???? ???? ?? 2??? ??. ??? ????? ???? ??? 3? ??? ?? ???? ???? ???????? ??? ? ???? ????.
◇?? ???? 4??? ??? ?? ??…“????? ?? ??”
25? ???114? ??? ?? ??? ???? ???? ??(0.06%) ?? ??? 0.05%? ????. ???? ?? ???? ?? 0.03%, 0.06% ????. ? ?? ??·??? 0.07%, ???? 0.04% ???.
???? Δ??(0.09%) Δ??(0.08%) Δ????(0.06%) Δ??(0.02%) Δ??(0.02%) Δ??(0.02%) ??? ???. ??·??? Δ??(0.16%) Δ???(0.13%) Δ??(0.12%) Δ??(0.12%) Δ??(0.11%) Δ??(0.11%) ??? ???. ?? ??, ?? ? ????? ??? ??? ?? ??? ?? ??? ????.
◇???? ?? ??…??? ?? ??? ??
??? ????? ?? ???? ??? ??? ??? 0.10% ????. ??·??? ???? ?? 0.09%, 0.05% ???. ?? ????? ?? ?? ??? ???? ??? ??, ?? ??? ????? ????. ?????Δ??(0.28%) Δ??(0.24%) Δ??(0.16%) Δ??(0.16%) Δ??(0.13%) ??? ???.
???? Δ??(0.13%) Δ??(0.10%) Δ??(0.07%) Δ??(0.07%) Δ??(0.06%) ??? ???. ??·??? ???? 3???? ?? ??? 5?? ?? ??? ?? ??? ???? ?????. Δ??(0.21%) Δ??(0.18%) Δ???(0.17%) Δ??(0.15%) Δ??(0.13%) Δ??(0.12%) ??? ???.
??? ?????? “?? ??? ??? ??? ???? ?? ????, ??? ???? ?? ????? ???? ???? ??? ??? ?? ??? ??”? “??? ???? ??? ?? ???? ???? ??? ???? ??”? ????. ?? ????? ??? “???? ???? ??? ????? ?? ??? ??? ???? ??? ????? ???? ????? ?? ?? ??? ??”??? ????.
?(??=??1)