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赥λԭΪx ĿɵãУá ΪλԭмʮԱԲxȡֵ֤ x=60ʱ㣬x=50ʱǡ㡣 ԭΪ50ˣĿΪְԱ

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ƻԱڹλŮְ55ݡ ͶʵʩȫְʵͶͬƣ˴ͳ˸ɲݽޣְλȷݣҵƻԱڹҹ涨רҵλŮԲƻԱӦɲ...

Ƭ ŮԱ Хե (1985) : : ǧ[ : / ֮ / Ԫҹ / ľɳ} : Ƭ/: ձ : ӳ: 1985 Ƭ : 62

Ӳѱ߲ݣ˵ŮְԱԹ˾ڲӰ첻ãϣᣬ˾¶ѧûˣʧ~~

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