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

3?? 4? ??? PC???? ???? ???? ??? ??? ???? ?? ‘???? ??? ??? ?? ???? ???’? ??? ???? ?? 6?66?? ?? ??? ? 83.86%? 5?87?? ‘???’? ????. ?? ??? ???? ??? ??? ??? ??? 13.76%(8?41?)? ????.

???? ???? ??? ??? ??? 8?8?71? ??? 80.8%? ‘??? ???? ??’? ???? ???. ???? ??? ???? 14.9%? ????.

???? ?? ???? ???? ? ??? ???. ??? ?? ??? ??? ??? ???? ‘???’ ????(3?9?33? ??)? ??? ? ??? ????? ??? ????? ?? ???? 90%? ??? ?? ??? ??? ???? 50～70%?? ???? ??? ???.

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