通过单片机发送命令过来，而进入到答题或者选侧正确答案 通过模拟键盘能够测试-Through the microcontroller to send commands over, and into the side of the answer or choose the correct answer to the test by simulating keyboard

通过单片机发命令，出项题目，并且进行选择答案，并判断对和错。现在可以通过键盘进行模拟-An order by the microcontroller, a key topic, and to choose the answer, and determine right and wrong. Can now be simulated by keyboard