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̳ ȸ ϱ 븶 ֹ, ȹհǼ, û 18 ̿ ෮ , ϱ õƴ.
2 (̿ ) α λ, ַ ⡤ ̵ Ǹ , ̿ Ͽ ϴ ֹε ෮ ϰ ִ.
ǿ ̿ 븶 Ͽ ȯå⺻ ְ 65dB , ߰ 55dB Ͽ ϴ, ֹε 忡 Ͽ üϴ ٸ ̶͡ ͡ ߴ.
ȸ ֹε Ϻ ϴ , ̰ ġ ʾ ֹε ϻȰ ް ִ١, 䱸ߴ.
ƿ õ2 ӵ ü 80km ġ ߰ ϱ ٸ ӵ ߰ ܼī ġ ̿ ܼ ʿϴ. ߴ.
ڴ ̿δ ڵ뵵μ ݻͳα ü 70km, õõ õ2α 60km, õ2κʹ 80km ְ Ư Ͽ μ Ͽ ϰڴ. ߴ.
ǿ λ ϴ ڵ 뵵 ܼ ϰ ִ ˰ ִ., ̿δ 7 ȸθ ̿Ͽ λ ʿ ෮ ߴ. ֱ å ֿ켱 ͡ ߴ.