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比手畫腳看聲音 |
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比手畫腳看聲音 11 大家動動腦,轉轉腦細胞 想一想,杯子為什麼會發出聲音呢? 22 大家動動腦,轉轉腦細胞 1.大氣帶來的變化 2.摩擦力帶來的震動3.杯子比較喜歡女生 33 答案揭曉 2.摩擦力帶來振動 外力(手指上的水)玻璃產生摩擦力 摩擦力讓杯子產生“振動” 44 聲音從哪裡來 人 聲帶振
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