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                 3.4 แรงเฉือน


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               4. ผู้ค้นพบกฏแรงโน้มถ่วงของโลกคือใคร


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               5. แรงแม่เหล็กสามารถนําไปใช้ประโยชน์อะไรได้บ้าง


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