远距离的电化教学,具有超越时空、开放等优越性,是进行成人教育的重要手段,但也存在着明显的不足。老师上课既要备教材,又要备学生,但广播电视的授课人由于种种原因不能充分地备学生,至多只能是宏观上备学生。授课时,由于得不到学生的及时反馈,只能是按原订计划照本宣科。学员对教员,只能听其音、观其貌,而不能当面请教。学员作业、听课中的问题,都迫切希望有人答 The long-distance teaching of electrification has the superiority of transcending time and space and opening up. It is an important means of adult education, but there are also obvious shortcomings. Teachers should not only prepare teaching materials for classes, but also prepare students. However, radio and television lecturers can not adequately prepare students for various reasons. Teaching, due to lack of timely feedback from students, only according to the original plan according to the scripted. Students on the faculty, can only listen to their tone, view the appearance, but can not face to consult. Students homework, class problems, are eager to have someone answer