有关波在传输中的一些程序，主要是声波的传播特点。画图注意问题-For some waves in the transmission process, mainly acoustic wave propagation characteristics. Drawing attention to the problem

数字麦克风 该MP45DT02是一个紧凑，低功耗，顶级端口，全方位，数字MEMS麦克风。该MP45DT02是建立与感测元件和立体声功能的IC接口。传感元件，能够检测声波，利用制造-The MP45DT02-M is a compact, low-power, top-port, omnidirectional, digital MEMS microphone. The MP45DT02-M is built with a sensing element and an IC interface