THE SMART TRICK OF LA CARTA THAT NO ONE IS DISCUSSING

频率是单位时间内完成振动的次数，是描述振动物体往复运动频繁程度的量，为了纪念德国物理学家赫兹的贡献，人们把频率的单位命名为赫兹，简称“赫”。The corporation just released an updated version previous week, and it'll be utilized in above 50 undergraduate and graduate school rooms th