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(õ=1) = õô 7~10 Ͻ ʰ ߹ å 18 ǥߴ.
ռ 7Ϻ Ӱ Ϻ ´ٴ ο õô õ ߴ.
µ̷ ȯ ٴڿ ִ Ե ġ ľǵƴ.
ô ϴ ž ġ ϰ, ġ ߱ ȭϴ ġ 10 6úη ջ· ߴ.
õô 9 10 06ñ ġ 0.05ppm ʰ ľǵ ϻ굿 ݳ뵿 ֹε 糭ڸ ȳߴ.
õô ֹε ο ݿ ü, ûҺ غ ü ϱ غȸ ϰ, Ÿ ü ո ȹ̴.
߹ å ҳ ⸦ ġ ǽð ϰ ʵ Ŵ Ȳ żϰ ü ġ ֵ ýȭ ̴.
ǥ ϴ , ȭǸ ˺Ӱ µ 1 0.05̴
̰ ϵ ȯ漾 " ̳ , Ź ϴ ɹ Ⱓ Ǹ Ű ֿ ǰ , () Ͻ ü ġ ̹ϴ" ߴ.
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αϽø ˸ ȳ 帱Կ.