节拍器可分为机械式 电动式和电子式三种 其中机械式节拍器的工作原理是利用发条旋紧 储存的机械
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节拍器可分为机械式、电动式和电子式三种，其中机械式节拍器的工作原理是利用发条旋紧，储存的机械能慢慢释放作为动力维持节拍器发出周期性的声音；二胡、管乐乐器都是满足____条件，发出悦耳的声音。 Metronomes can be divided into mechanical, electric and electronic types. The working principle of mechanical metronomes is to use a spring to tighten, and the stored mechanical energy is slowly released as the power to keep the metronome periodic sound. Erhu and wind instruments were both served to provide a pleasant sound.
A．驻波 Standing Wave;
B．行波 Travelling Waves;
C．横波，行波 Shear Wave, Travelling Waves;
D．纵波 Longitudinal Wave;
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驻波 Standing Wave;