Thermodynamic equilibrium, in which there is no tendency for the state of a system to change spontaneously (自发地). 热力学平衡,其中系统状态不存在自发改变的趋势。
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When the wave propagates (传播) in the medium, the kinetic energy and potential energy of the volume of elements (体积微元) have the same changing laws.
A. 对
B. 错
负反馈放大电路中,若反馈信号取样于输出电压,则引入的是____反馈,若反馈信号取样于输出电流,则引入的是____反馈;