This takes into account the problem of the platform and the teacher in the production of teaching materials part, because Blended learning is not the teacher's teaching materials directly to the cloud to let students see, the platform and teaching materials must have a good design, if he design is better, such as face to face is the teacher-centered teaching methods If you can make up for the online way, that is, the student as the learning center, that is the lack of teachers to spend more time designing teaching materials, will take up more time teachers.
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