声音的高低由什么决定 A.�声体的振幅b.�声体的材料和结构c.�声体振动的�率d.以上都不对 题目和参考答案——青夏教育精英家教�—— Template




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tomski声音的高低由什么决定 a.�声体的振幅b.�声体的材料和结构c.�声体振动的�率d.以上都不对 题目和参考答案——青夏教育精英家教�—— coloring