说明：  1、测试D触发器的逻辑功能。 2、触发器之间的相互转换。 3、用JK触发器组成双向时钟脉冲电路，并测试其波形。
(1. Test the logic function of D trigger. 2. Mutual conversion between triggers. 3. The two-way clock pulse circuit is composed of JK Trigger and its waveform is tested.)