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_XǰҪæ_ʼԇ^һ܇ĭh(hun)İ϶CoһЩע
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1. ·Ͽ ϲ̫澏ĽhҪܕ(do)߀]ԇ˯XĿԇͲˡ
2. ʾԇǰԇrһҪX@һ“ҺJ(rn)؏(f)(x)^ѽ(jng)Բ˟o(sh)Σ@ôĥ@ôĿǞ˽IBTһ”oՓ֮ǰDzǏ(f)(x)ȫ˿̲Ҫ]ôֻ࣬һԒ“Һֵܳ(zhn)Ҍȡø߷”
3. ǰԭʼЧķ;չwһښ