?? ?? ?????? ??? ??? ?? ??? ????.
??? ??? ??? ????? ???(全商一)??? ?? 96~97? 2??? ??? ???? ??? ?????? ???? ?? ??? ??? ‘??? ????? ??? ??? ??? ????? ?? ??’?? ????.
?? ??? ??? ??? ?? 8?? ?? ?????(60ppb·1ppb? 10??? 1) ????? ??? ??? ????(?? 20.9ppb ??) ??? ??? ???? ?? ???? ??? 3% ???? ???? ??? ????. ?? 65? ???? ?? ????? ????? 20.2~27.8%, ?? ??? 3.3~8.9% ???? ??? ???? ?? ?? ? ???? ??? ?? 16.8%, 10.5% ????.
〈?????〉mungchii@donga.com