[??]21? ?? ??…?? 16?·?? 21?·?? 22?

???? 21? ? ??? 23??? ??? ??? ??? ????.

???? ??(21?) ???? ???? ??? ??? ??? ??? ???? ????.

? ??? ??(10.7~20.7?)?? 2~4? ? ?? ???? ???, ?? ????? ??? 15? ??? ?????.

??? ??? ?? ??? 20? ???? ????, ??? ?? ??? 23??? ??? ??? ??? ????.

?? ????? 0~11?, ? ????? 12~23?? ????.

?? ??? ?? ?? ????? Δ?? 5? Δ?? 5? Δ?? 1? Δ?? 9? Δ?? 7? Δ?? 4? Δ?? 10? Δ?? 8? Δ?? 8? Δ?? 12??.

? ?? ????? Δ?? 16? Δ?? 12? Δ?? 16? Δ?? 18? Δ?? 19? Δ?? 22? Δ?? 18? Δ?? 20? Δ?? 21? Δ?? 21??.

???? ??? ???·?? ??·??·??·??? ‘??’, ? ?? ??? ‘??’?? ????.

??? ??? ?? ????? 0.5~1.5m, ??? ?? ????? 0.5~2.0m ???. ??? ?? ??? ?? 2.5m, ?? 3.0m, ?? 4.0m? ????.

(??=??1)