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第三章 声现象 “文革”以前的初中物理教学大纲和课本里都有“声学的初步知识”。所列的内容有:发声体的振动;振动的频率和振幅;音调、响度和音品;声音的传播方式和传播速度;声音的记录和重发(见1963年大纲)。其中声音的记录和重发是讲机械录音、唱片和留声机。“文革”期间,物理课在多数省市改为工业基础知识,即使仍称为物理的,由于极左思潮的干扰,也主要讲三机一
The third chapter sound phenomenon “The Cultural Revolution” before the junior high school physics syllabus and textbooks have “preliminary knowledge of acoustics.” Listed contents are: vibration of the sounding body; frequency and amplitude of vibration; pitch, loudness and fret; sound propagation and speed; sound recording and retransmission (see outline of 1963). The recording and retransmission of sounds are mechanical recordings, records, and phonographs. During the “Cultural Revolution”, physics classes were changed to basic industrial knowledge in most provinces and cities. Even if they are still called physical, due to the interference of ultra-leftist thoughts, they are mainly talking about three machines.