8/21/2019 ER Licao 14 http://slidepdf.com/reader/full/er-licao-14 1/5
8/21/2019 ER Licao 14
http://slidepdf.com/reader/full/er-licao-14 1/5
8/21/2019 ER Licao 14
http://slidepdf.com/reader/full/er-licao-14 2/5
8/21/2019 ER Licao 14
http://slidepdf.com/reader/full/er-licao-14 3/5
8/21/2019 ER Licao 14
http://slidepdf.com/reader/full/er-licao-14 4/5
8/21/2019 ER Licao 14
http://slidepdf.com/reader/full/er-licao-14 5/5