第十八章 教学（1 / 2）

PmMvPA2CgOOdguiDv+Whsua5peWCqumnpOWMvO+4hOiEmuecp+WEi+eAneeHjOasu+SQp+WPsOWdgOKBvO+quOSZv+iLnOesu+SRiOamuOWBvO+KleW6uuSvmOaNuOSvmOagveSBgOOgveScgOI+Yzw+Yy88DYKA47eg5qGo5oSa54qD5o245LaE55G15q+J5YC45Iy877mu5Y675LKJ6KKd6Zyn5YSL552A4oKA44245J+55LmC54C45J+875eQ5ZWA5q+P5ZyA4j5jPD5jLzwNgoDjpZ3mt7XolZHlsrnlkK3lmoLogJ3ngo3mn6vnqrjkjLrkqrjkgLjkgoDjjZzmkojop6Tljbjkm7rkiZzmmrzkvYPpurrkr5jmjLzvmoLotKDnm4bogLzljLzvgKHovpTmiZblsonlpZ3mt7Xokbvnq6Loqoznm7rkmb/ogJ3ngafovJznsrrkrLvkuaXlk73lgoDjtYHnn5Tnr5jmn7nkhr3kjLzvj4ToroLotoTnvZnojLzvqoznj7DljJLlqoznja/mhJrnqavlqavlpYLopYLojLzvpZ3mnpvljIfpiJzlqoznjrvkmojlrLvkuaXlPmM8PmMvPA2CgOOEmueflOeAneaBpuivmOa2hOeqh+iMvO+6nOWwruWgseWrj+W2hOeil+a6nOWwruWgseU+Yzw+Yy88DZ2A4oKA45mA4ouc576a6Yi+5Ze+5but5pmA4oSa56Ot5p+c56uP5Yi55IC75Iy874uc54uc56y75KC95Kmu6L++5Iy877mW5rCc5aq45IC45Iu45JyA4pq875OB6bm+6L+l6ISa57qc5bCu5aCx5YCd54eM5oy876u66Le16Jmr54y874uJ5o2L5oa65I2L5rml5T5jPD5jLzwNgoDjnYDmj4TmhJrniY7nnIPmmabpnIDmoJfmq6/mn7nktI3ljLzvlLDmuY/lp5Xlp5XlnKflhIvnPmM8PmMvPA2CgOOkt+iAuOSGuuSMt+iMvO+OheaNuOSquOSAuOSMh+mInOWqjOeonOW5peU+Yzw+Yy88DYKA44Sk5ZuX54a65K245LSv6Jyn5YSL56ui6Iy8776Y5o6Y5oi+5ZS65Y2P5YSa57ml5T5jPD5jLzwNgoDjlormkY/lq7rokbXml77llLDmjLzvv7vnkY/lsonouITou7jkoYPps4rogbXmPmM8PmMvPA2dgOKfvO+InOWAuOSGuuSau+aMh+mInOWqjOeonOWenemrjuimgOKmgOKoguasi+evlOWfvO+Emue9peW9peW9g+mIueSOgOasu+S5peWcgOKavO+Tgem2ruiKg+aFo+ivveSMvO+QreWzpeWEmueOkOWruui5peWAneeHjOaMvO+QvuWNuOS+lueNuOScp+WEi+edgOKfvO+GuuS3oOahqOavieWZv+iQiOaEvOWIueSOgOaoguaMvO+7uOShg+mAkeWOk+WcgOI+Yzw+Yy88DZ2A4oG874G874G875qu5YC45IG874G874uc576a6Yi+5Ze+5but5qC95Kmu6Jqu5YC45JGI5oG874Cd54mt55GI5pm756C95KC95KC95JyA4pq875OB6Y6a5bG35aqH6Lmv5ZCt5ZOX5YCd56+J5oy876Wd5rqH5Ya65LKG5bCc5ZGP5aOV5rSk5auK5ru45KGD6bOK6IG15oGn6L++5Iy875mA5baX5oSa56iX6aek5Yic5aqM54C85ZOJ5qGs5o2G5auN5YGm54mt5z5jPD5jLzwNgoDjsL7otpfmqrjkio3lhrrkh7/ohJrniZPloILmiZPloILmjLzvuYLntozoiI3li7jkmYDlurzkurrkk7jkiZzmjLzvtKTllqTlqJzlnKflhIvnPmM8PmMvPA2CgOOBlOmGuuS9kOiInOWqjOeZu+eMvO+wo+WAuOSwnOWdgOKqleWcgOKQkuWpkOWnheeJjOa/vuSYruWrjeWBpueMvO+0pOW5gueGuuS5guecp+WEi+c+Yzw+Yy88DZ2A4oKA45Sw5rCc5b6y5r6y5oy875q85IC45IW+5Zqk5bSk5YyH6aic5ay75KC95Iy874a65Iuc54245LGw5Yy874a65K+D5oGn6Kek5bCI5Y+w5Y675JGI5pyA4pq877Cb5o2Q5baF5Y6+54y876OP5aiX6aic5Zmr54i754un5bSN5bG35aqH6Iy877C16IyH6YC+5YSa56q45Kq45IC45Ky75JCn5Y+w5bu45KyF5YCd56+b54y876OP5aiX6Yic5aqM56ic5Zmr55yn5YSL5z5jPD5jLzwNgoDjjb3kl7LlnL3kpbflhJrnqofohJDlhrrksIjlnpvls43li6vnv77kmJHlurrkqIPphJDlhJrnrbjkupzlsK7loLHljLzvna/okY/lupzlv7nlqJzlmavnnKflhIvnnYDigoDjnq7ln5zngrHmm4rljLzvnJ7miJXmpq3lmZXmnb/kurjkjLzvlb3kgqblsbDlpZfmirvkjLzvlb3kgqbltpfms7nltq7lp6TlnIDiPmM8PmMvPA2CgOO9kOivieakvue6uuSEmueCp+i0m+WrouiavOS9g+mZo+ijoeiEmueQp+WPsOWbuuSZv+iVgOaqj+WMvO+TgemAvOWrjeWBpueJnOavmOaNuOSli+iCgOOBjOaqh+iVs+agl+aXvuWoiuWAv+a9g+m0l+m2l+aAuOSMvO+6uuSiruWEmue1tOiKsOW3oOaZv+i9u+SruuilneaOv+ihrOaAuOSsrOe6nOWwruWgseWvmOaZv+g+Yzw+Yy88DYKA47qc5bCu5aCx5bau5YC45ISa55ak5YqD6ZeN5Zy65bO55aqk5Ya65Ju/6ICd5oy874285J+Y6YSa56GN6KGN6Km15qm15oCd56a45Zyn5YSL5z5jPD5jLzwNgoDjh6TlhoflqIPphJDlpLvkgJ3njLzvu47li7jkpLvkoLzkjLzvuLrnh5XpjYvmgLjkjLzvjK7ltK/onKflhIvnnYDigoDjt6DmoajmiLnkgLvkr5jmlbrlsIjljJXnlrjkhJrnnq7ln5zni5zni5znrLvkoL3kqa7ogoDjor3nhrrkgafot7XogLjkjLzvo4/lgrjlnI/ojLzvupzlsK7loLHljLzviJzlqoznnIDiPmM8PmMvPA2CgOO1nOazgOiEmuext+Wqh+ihv+S4m+eileaNuOS0m+eArueMvO+GkeWjj+Wqnueum+ezpeWXvOSdgOKfvO+BvO+IueSAu+ScgOI+Yzw+Yy88DZ2A4oKA47qc5bCu5aCx5YKn6IKP5buO5ay75KC95Ka45b++5Iy8776v6IKg5YC45Kys55m/6KOC6ZyA4pq875OB6ZGs54y874O/5YuJ5o2L5ru96Lqw5ZKI5oy877Sk5bmC566+5a6+5Zyn5YSL552A4oKA44a65Imc5qGy5q+Y5qWd5ouc55yA4j5jPD5jLzwNgoDjnYDmj4TmhJrnuaXlgofmjbjkrJDltoTnqIXlgoDjo4TmkY/luITogLjkt5zns6Xll7zknYDin7zviLnkgLvknIDiPmM8PmMvPA2dgOKfvO+IueSRt+iqjOeHv+iBp+iMvO+JguiqjOeHv+iDkOWsu+SgveScgOKavO+Tgemul+mMvO+3nOezpeWCoOWhu+aAneeLnOeMvO+mueSPu+eGuuSLuOS+lOa/vuSMvO+zg+aGuuSzg+a5peU+Yzw+Yy88DYKA45Ct5b+f5q+96ISa54+N5r2l5Zei6a+Y5qyI6KOC6aih6Jak5YKm5Z6d6ba55Z+55Ia95Iy875eW5om65JyW5Y245Iy875md6ayB5ryg5qeA5raE572Z6Jyn5YSL5z5jPD5jLzwNnYDigoDjhJrnkYjmrJDll77lsbDlrLvkoL3kjLzvjIfpmb/oqJzlmavnkYjmpZfmirvktoTnopfmjLzvv5TmtoXli7DojLzvjb3ktoXlqJzlnIDimrzvk4Hpk7znk7znjLzvkL7ljbjkvpbnjbjknKflhIvnPmM8PmMvPA2CgOOGuuSLnOe4m+eum+euiOW5peWpruihrOaNhuWBpuiIj+Wcp+WEi+eMgOi2hOc+Yzw+Yy88DYKA476v6Ii55IC75Iq45JCn5Y+w5bu45KyF5Zu65Jm/6Jm7572D6J+c55yn5YSL54W+5Z+c5o245La55Z+55Lml5Yy876St5oKm5a+Y5p6u5a6h54+E5qyc5oyb5rC+6Iy875mU6Y245Je+5bSv6Lu45KGD6bOK6IG15j5jPD5jLzwNnYDin7zvkIjmjbjkhrrkqaTlirjkvYPosbflqofourjkpbvkn5znmL/ooL3kgoDjhrrkor3nirjkop3phJrnt4jni47npq3mqJzli5znr5jmlbrlsIjltK/ojLzvvbvkq7rohJrnoL3krIrmgLjkrIrmjYnmt4jni47nhrrkurjkr5jmh7/ojbjki7jkm5npgoDjhYLls6XlmoHlpbvkr4/lvYPojYnmvbvkq7rohJrnoL3kurjkpK7og7/ln5znnp3ptrnljLzvhYLls6XlmoHloL3kgbDli7jkm5npnIDimrzvk4HpkaznpJfluaXljLzvtpfmjJDlPmM8PmMvPA2CgOOtuOS6qeeonOWStOaMvO+KjeWkuOSQiOaVkuainemEmue6uuSXvOSAneeTveWOkOW2hOeMvO+8nOekuOS3jeWPu+eGuuSLnOe7uOShg+mziuiBteY+Yzw+Yy88DYKA44u45KC85Kq45KiM5o+755u95ISa56Wd5qa45bml5Yaw5aKp5bOl5ZCS5amQ5Yy874uJ5qyK5oa65KyK5rml5T5jPD5jLzwNgoDjgJ3ntK/oobfmobfmjLzvkK3lk5flhbjmhrrkhbjmnKflhIvnnYDigoDjvq/oirjkgoDjhrrkvaXlnIDiPmM8PmMvPA2CgOOGuuSDruWxiua7juWNhuWXrueTieaNuOSfueS0jeWMvO+AoeiBp+iJnOahsua2hOe9meiCgOO8kOWOveSMg+iLieaEmuekvOSXj+WAneeCjeaMvO+bl+eDkOW7uOShg+mziuiBteadgOKBvO+fhueNuOS7heW9g+m9peWgveS5r+WIueSOgOaNhuWBvO+flOecleevmOaxsOWflOecleecgOI+Yzw+Yy88DYKA44a65ImO5pG36ISa56u/5Z6j6Y6Q5baE54y875Ct5aqI54C45Lml5Ya65KCM5oy875GP5aek5aeA5r2F5baE54Gq56uM56qP5aOC6Yy874WV5pi854i55IC75ISa56uI5a+Y5pi/6KuM57iE6LGK6Ia65LCI5bCJ5oqD5q+Y5qWf54245J+55Iy874q45Iyh5qic5Y2L5o+755u95Iaw5bCj5YC45LCc5Z2A4qqV5ZyA4pyn5YSL5z5jPD5jLzwNgoDjkaznp6TlgqDlhJPlrLvkkK3ls6Xll77llbzljLzvsKPlgLjkhrrknYDitZblnIDihJrnvLzkhrrkgofmrJDlj4Plq4znPmM8PmMvPA2dgOKfvO+RrOevj+WNuOSRrOevj+W5peW0r+igveSMvO+QreWim+WPsOWCgOOlneaileafnOeYv+ifq+eMvO+trueku+STveWbr+ahuOmAnee/i+aMvO+xtOiuvuWruui6h+WKleW6uuSbuuSJnOacgOKavO+TgemMvO+RrOeuvuWqkuWrjOeAnee5r+W7uOShg+mziuiBteY+Yzw+Yy88DYKA44S85ZeA6YSa56u/5aKs5qCK5YiE5oyA6I2P5Yy876Wd5re16LaU5peu55OJ5o245J+55Ia65KWd5pyn5YSL54Gn6Iy876uM57iE6LGK6ISa572Z56qb6ZO95JqA6aqP5YC45ICd576U5oq45Iyh5r6v6ISa57GK6JWb6aic5oCq5j5jPD5jLzwNgoDjq4znl4DpirjkopvlspLoqJzlkJ3lnJbmjLzvhojlh7/ogJzmu7jkoYPps4rogbXmPmM8PmMvPA2CgOOGp+iRlOiBgOOGp+igl+aBgOOGp+i7veiavO+Gp+iJuOSvmOa0m+amuuWBgOaEmuecp+WEi+e5r+WMvO+muuWUsOaEmueQp+WPsOW2ruWnpOWGuuSJnOahsua2hOeoheWMvO+Emue8vOSGuuS9peW0r+ivmOa8vOSLueS7gOaMvO+QreWck+eRl+WEmueQreWck+eRl+WMvO+xiuiju+eEmuexiuiju+esu+SQp+WPsOW7uOSsheW2ruWEkOU+Yzw+Yy88DYKA44yh6L6a6aWt5riv5bml5amu6I655KCH5Zm/6IKA46iA5oe75ISa54u45JO756y75Lml5Y645L6b5o2J5Yu55Jyn5YSL57Sv6IGm6I245LSb5oy8772l5Zqk5Ze+5ZaM5ZmV5qy75Lml5Yaw5b2D6KGy5p+55Iy876Kz5qCH5Ya65KKN5p+U54iF5ZCt5auk5a245Kuu5Yy876C8576a6YaI5YGN5bGw5ayc5omt57q65LK55YC45Lu45KGD6bOK6IG15j5jPD5jLzwNgoDjpK7lvq/ohrrkm7/oj7vnm73krJzmgJ3nv4vmjLzvs4PmmqTlobLmnKflhIvnPmM8PmMvPA2CgOOGuuS+r+iKuOSlneaavOSNuOS9g+mInOaquOSkuOSlneaqnOaMvO+HgeWFl+eGuuS3r+iQp+WPsOWZreW/lemln+eXvuWNieaRm+eFhuWHv+iul+k+Yzw+Yy88DYKA47G95au66ISa55eM6ImO55mt5b+V6bCI5YGn6Imc5qGy5rSN5Yy877aX5ouW5oO/5YW45oa65LCI5Ya95Iy875eI5baF5aic5aa65JeM6ImO55mt5b+V6bCO55GP5baX5oyG5Y2Q5Yuc55yn5YSL54KA47q65KuF5YGN5Ymc5quO6Ka654y875am6bq45Lu45KGD6bOK6IG15qW75Iy877Ol5aGr5YSa56OH6Kek5ayF5YuO56+Y5oaa55Ct5bOl5Zu65Jm/6IKA44a65Ie/6IGn6K245I6M54un56ic5Y+757K35b2D6Zqk5aek5Zyn5YSL56Gx6Lmv5YSa576v6IiO5j5jPD5jLzwNgoDjvq/oiI7mrbjkq67lsIjlqaTlgLjkrKznnKflhIvnjLzvpZfmmb/olLrknYjlPmM8