用木槌敲击同一个音叉第一次轻敲第二次重敲.两次比较 A.轻敲音调高b.轻敲响度大c.重敲音调高d.重敲响度大——青夏教育精英家教�—— Template




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tomski用木槌敲击同一个音叉第一次轻敲第二次重敲.两次比较 a.轻敲音调高b.轻敲响度大c.重敲音调高d.重敲响度大——青夏教育精英家教�—— coloring