本发明能够很容易地积累壁电荷，并且与以往急剧增加和减少的波形供给相比，提高了放电单元的应答速度。
The invention could accumulate the wall electric charge easily, and improve the responding speed of discharging unit comparing with the ancient rapid increasing and decreasing waveform supply.
通过自动智能应答，既加快了反应速度，又减轻了教师的负担。
The automatic intelligence response can improve the reflection speed and reduce the teachers burden.
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