说明：  （1）设计并制作一个具有高频率稳定度和高相位稳定度的低频函数发生器，频率可调，为1HZ-1KHz； （2）波形种类：三角波、正弦波、方波、锯齿波
((1) a low frequency function generator with high frequency stability and high phase stability is designed and produced, and the frequency is adjustable for 1HZ-1KHz. (2) the type of wave form: triangular wave, sine wave, Fang Bo, Ju Chib)