实验器材为一自制水槽(图1),即用透明有机玻璃粘合成一长约2m,宽约30cm,深约50cm的水槽,水槽的正面从底部起每隔10cm画一条横向的红色刻度线,有机玻璃挡板AB,CD可以垂直插入水槽,将水槽分成1,2,3部分,并可使各部分保持不同的水位。a.波的反射的演示。在水槽中装约30cm高的水,为 The experimental equipment is a self-made sink (Figure 1), which is a transparent sink into a sink with a length of about 2m, a width of about 30cm, and a depth of about 50cm. The front of the sink draws a horizontal red tick every 10cm from the bottom. The plexiglass baffles AB and CD can be vertically inserted into the sink, dividing the sink into 1, 2, and 3 sections and keeping the sections at different water levels. a. Demonstration of wave reflections. About 30cm high water in the sink is