投影媒体因其设备简单、操作方便、表现形式灵活多样，深受教师的青睐。但我们发现部分教师在利用投影媒体教学时，投影媒体的功效并未充分发挥。如用投影仪代替小学黑板，以增加课堂教学的信息量。长此以往，投影媒体的功效将黯然失色，学生对投影媒体也将熟视无睹。形式应为 Because of its simple equipment, convenient operation, and flexible and diverse forms of expression, projection media is favored by teachers. However, we found that some teachers did not fully use the projection media when they were using projection media. If you use a projector instead of a primary school blackboard to increase the amount of information in the classroom. Over time, the effectiveness of the projection media will be overshadowed, and students will turn a blind eye to the projection media. The form should be