下列哪些是教师应当履行的义务()

PHA+562U5qGI77ya5YWz5b+D44CB54ix5oqk5YWo5L2T5a2m55Sf77yM5bCK6YeN5a2m55Sf5Lq65qC877yM5L+D6L+b5a2m55Sf5Zyo5ZOB5b635pm65Yqb5L2T6LSo562J5pa56Z2i5YWo6Z2i5Y+R5bGV4oCU4oCU4oCU4oCU6YG15a6I5a6q5rOV5rOV5b6L5ZKM6IGM5Lia6YGT5b6377yM5Li65Lq65biI6KGo4oCU4oCU4oCU4oCU6LSv5b275Zu95a6255qE5pWZ6IKy5pa56ZKI77yM6YG15a6I6KeE56ug5Yi25bqm77yM5omn6KGM5a2m5qCh55qE5pWZ5a2m6K6h5YiS77yM5bGl6KGM5pWZ5biI6IGY57qm77yM5a6M5oiQ5pWZ6IKy5pWZ5a2m5bel5L2c5Lu75Yqh4oCU4oCU4oCU4oCU5a+55a2m55Sf6L+b6KGM5a6q5rOV5omA56Gu5a6a55qE5Z+65pys5Y6f5YiZ55qE5pWZ6IKy5ZKM54ix5Zu95Li75LmJ5rCR5peP5Zui57uT55qE5pWZ6IKy77yM5rOV5Yi25pWZ6IKy5Lul5Y+K5oCd5oOz5ZOB5b635paH5YyW56eR5a2m5oqA5pyv5pWZ6IKy77yM57uE57uH5bim6aKG5a2m55Sf5byA5bGV5pyJ55uK55qE56S+5Lya5rS75Yqo4oCU4oCU4oCU4oCUPC9wPg==