第20章 打好基础（2 / 2）
PmMvPJyA4i4uLoun5YC85a+c5qu66Im45ISa54Ch57qf5YCc5o675IiF5ZyA4oy876u66Le16Jmr57Cc5ZuM57q65KO46ZyA4oG8772l5ZyA4j5jPD5jLzyCgOOEmuegueSDu+eBpuivmOaYv+igueSmreWBpuizg+aQreWym+aEmueVjeWAruebuuSAuOS8lua5r+WMvO+um+eym+amuuW+mumYq+mEmue3oOaZv+iLgOOym+ajuOmPpeWJheWInOaKgOOPpeWUvOaOvueMruW9g+iPu+eyt+WVgOaqk+WUgOKUgOK3oOaAuOS0kOeikum5vOWPg+WxsOWMvO+GuuSwjueRj+W6uuSjuOk+Yzw+Yy88goDjhJrnmq7lr4Lor5jmtoTnk73liKHmlK3nPmM8PmMvPJ+875eQ5aat5aiU55i/6K+c5rCN5YGw5YCh57qf5Y2n55m/6Iy877Sv6KWd5rq65ISa56+c5ou55J6l57eb6Z6j6aGP5oyO5o+757K35aq45IC45LyW5rmv5Yy874e/6I245IKA44u16Kmk5a+c5rCN5YGw5YSa57qH5bCO55Wx5Za75I2H6Yuc54i+5YSa55+c56+Y5rSk5YGA6KO75Im45KWd5ouc5z5jPD5jLzwuLi6KleWLgOOsk+ahqOa0ueWJuOSDgOiYq+m0ueWUuuSKgOOEmueIieevnOawjeWBsOU+Yzw+Yy88Li4ur5jmj4PlsbDltJvngK7njLzvlbPmuZbmoLnkg7vnjJLluq7ohpDngKHnup/lhJrnr5zmsI3lgbDlr5jmvYPpu7rpu7rphq/lhq/lop3pjIfpjLzvu7/nhrrku7/ni4nmqJrppZ3mt7Xov4vmurrko7jpjLzvi4DjoLzkmKfnr5zmsI3lgbDlioDjhJrnjYfpmo7lrJzmgLjkl5HouaTlmL/ojIfphqDltL3oso3mjLzvr5jmhJrnlqTlj4Tmlrvkqa7ogJzmPmM8PmMvPJyA4oKA46iF5bqM5pi/6Lux542n54y876+a5aaA4qaA4q+c5ou55Ku66IaI5bG95S4uLrC16LCc5YGA46Kz5rG55LSw5pyA4oy875eR6KiP5bW/5bCj5Y+w5Za75JyA4i4uLoGB6beb6Yy874GB6bSw5oy874GB6Y6j6ZyA4j5jPD5jLzyCgOOXreWnpOWquOSgh+WcgOK0oOeBquenpOW3woGB6Y6j6ZyA4peR6JmG5bCc5bCZ5oW45qKd6Yq45Iy877eN5YC45ISa56Kd6Yq45ICc5oC85bu/54uJ5qia6bq65KO46T5jPD5jLzyCgOO0veiyjeavnOaNv+WWu+S2heWGoOWAuOSGuuSgteiEmemYv+i2hOeFseWju+SJuOScnuaTu+eMvO+vnOaruui/m+aBgOOvnOaruuiYj+WBgOOvnOaruuiGiOWUgOKUgOKvnOaruuiJuOSEmueAoee6n+WAnOaBpuizg+aqj+WsnOafjuU+Yzw+Yy88goDjuZbmp6TluozmmL/otKTlgYDoo4LpsIjls4PmobLmPmM8PmMvPIKA45et5YeW5oSa55in56Wl5a+c5o2/5ZeR6L296LCu6Ju65KOC6Ye/6JqK5ru96Lu96Jaw5YeM5oy874uJ5pOQ5oa65JOQ5rCc5Yul5bSF5Za75IKA47S96LKN5q+c5o2/5YSa56Wd5oGm6IyH6aOC6aO75Im45I675JqI5YC85YqR5oq45JCt5Yyh5qic5bCc5YW+5YqP5Y245Ku/6Iy875Ov5ayF5Y+w5YSa57G35aqH6Ia65LCI5Z6b5bq65KO46T5jPD5jLzycgOKBvO+GuuSLieawiOW8luaIu+eMvO+GuuS9peWqpOWcgOI+Yzw+Yy88lIDilIDilIDilIDilIDilIDiPmM8PmMvPIKA46mJ56qA5oSa54aQ57i45Yq26IW26LqH5Z+U556v6L2D6LSN5Yy874iQ5YS754Sa55qA6a6Z5ry85Iuc54y875mA5baX5omc5oyA6Iy876GH5bO55byW5pK95Zq85IyA6I2P5Yy8742e6KS65ImE6ICh6ISa56ek5bq85aGC6KS45Iy875mA5baX5omc5oKA44aQ55OB6bKu6I245KWd5o675KC16Iim6YSa55C/6L2R5T5jPD5jLzyCgOOFgOiNv+WEmueHpeWgl+azueWzueU+Yzw+Yy88poDipoDiqrjkgLjkr5jmqo/ltI3liLvngJzmkK3lqa3lhJrnrLvklrvkr4/ljLzvsLPllLflhJrnr5zmsI3lgbDlr5jmsrrkja/mjLzvnqXni7nkhYDojb/lr5jmsrrktojnjLzviJDlk7vniYTogKHohJrngKfnmLzkgJzmj5fmgLjkobbmqbzmjJLlj5fmgLjki4nmg43lPmM8PmMvPIKA45Ct5amt5YSa57q65Kek5beI5rSw5oyS5bq65Kek5aO75J2I5Y+D5bGw5T5jPD5jLzyCgOOVs+aPh+WgiuWEmueVjeWAruevmOaNuOSxsOWlneaOu+SMvO+Fg+aLuuSNp+eZv+iLteippOWMkuWJhOiAoeiCgOOBlOmBsOWaiOWRh+mhj+aMjuaquue0ueWEmuePsOW8ueWkreaCpuWonOW9g+i6uuSjuOmEmueJhOiAoeihtuapvOaKjeWAuOSJnOaqj+WIueSAu+S6uOS2qeext+a7juWJnOahsuaWu+Q+Yzw+Yy88goDji7XoqaTlhJrnpYjlp7rnva3llqblpoDipoDir5jmtJvngK7nPmM8PmMvPIKA45qO5ZO15q+Y5oW75IW75I245Iy874245IKA45qO5ZO15qCK5bSb5q245I+D5bOD5pSv5oy874mE6ICh6KG25qm85oSa54y35oG15qeF5ZO95Iy875Ct5b+E5YSa56iX6bSw5j5jPD5jLzyCgOOXkeiKkeWjruWRluegl+a+k+mBlOmEmueoiuWeiOibuuSjgumMvO+7iOWkreaGveSMvO+uq+miuueEmuengOaMquiZqOaPl+aAuOShtuapvOa/ieanu+e9g+ihsua2hOe9meiMvO+bnee8nOeEmuedk+ibueaMvO+uq+m0pOWEmueyieiRh+mCgOOKuOS4hOiEmuepq+WaqOegvOWjgum6uuSjuOmwiOW7p+e+k+mBlOmOu+SJheWum+eEmueju+SJuOQ+Yzw+Yy88goDju5fpqpzmgInmu5fptJvngK7nlIDilIDihJrnt6Dmmb/ourrko7jpj4Plhr3kjLzvjYnmqaTlsJXmoJfmh7/ogafolrvkjLzvsb3lq4HnhJrnmIjmp6TljJXnjb/loazmpLjkh7/ot63mj7vnurjknL3kPmM8PmMvPIG875+874GU6YGw5ZqI5ZGH6Ya65JKG6Ymn6LaE55+r54y875Ct5amt5YSa54Gy5Ym45Imc5qqP5aq45IC45KaA4qaA4oGy5Ym45D5jPD5jLzyCgOObiuWxn+a6uuS+sOWdueSju+SdiOW6uOSQiOaMvO+Ji+aLheWln+aEmue+sOWdueS2iOWLjuW9g+iNiea5peWMvO+vnOawjeWBsOWEmuePl+aAuOShtuapvOa8luaeseWsi+eZv+iJl+ith+WvmOajreaMvO+0ueWTveWCgOOxveWruuiEmue3iOa0sOahtuapvOaUgOKUgOK7puWLueSxveWrgeeju+SdiOWHv+iql+mtuOS3teaRhOiEmueWu+SMvO+vnOaNv+WquOSZv+iGuuS6h+WkruixsOW0l+msnueju+SJuOQ+Yzw+Yy88gbzvn7zvgZTpgbDlmojlkYfplIDilIDir5jmmb/oPmM8PmMvPIKA46Si6Yec6a6+5a6+5ZSw5rqp56mu6KiK5aKz5oSa54mL5ouF5aWf5oy876iK5Z6I6K245Lqp56ic5ayI6Ieb6LWB54yQ5YKm5Yy877qH5YyA6Li85La75Y6Q5YyD6Lq65KO46Y675LaE56Sq6b6T6YGU6bKJ6JGH6YSa56iS54CS56Gd5rCV5j5jPD5jLzydgOKBvO+UgOKUgOKwlOWcgOI+Yzw+Yy88nYDin7zvp5Dls67liY7liL7lgbzvhrrkpZ3muoflqJTnv73kpbvkr4/lsbDltoTngarnqrjkmb/onIDijLzvua7lkaznhJrnj4Tml77luYrmgLjkt7XorInmkqfotJjljLzvgofojI/lgLzloLzlurrko7jpnYDigbzvi5znnIDiPmM8PmMvPIKA462W5pOJ5pW65bu95ZW55YC45ISa542J5byc56ui6Kq7552A5oSa55a75Iy875Kn54C45Iu45IyA6LaE5z5jPD5jLzymgOKmgOKMleeQmemnu+eAoeiGuuSQiOakruivr+ivnOaNv+WEmueagOmumeaKiuavmOaqj+WQreWpreWZv+i4ruiWiOamgOKmgOK5gueZnem3huU+Yzw+Yy88gbzvn7zvvYPor4/liLnkjoDmmb/ogbzvn7zvjJXnkJnpp7vngKHohrrkkobpiafourrko7jpobbmqbzmjLzvirjkjKHmqJzliY7msKPlgLjknYDikpflqpXlnIDil5bmuI/ojLzvq7rot7XomavnsJzlm4zno7vkibjkPmM8