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起始时间 0:00Introduction to Balance Scale

Make a Balance Scale

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起始时间 02:02Assembling the Balance Scale

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起始时间 00:14Adjusting the Scale

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起始时间 00:15Introduction to Balances

Using a Balance | MIT Digital Lab Techniques Manual

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起始时间 00:12Introduction to Beam Balance

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起始时间 01:33Why Major and Minor Scales are Important

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起始时间 00:43Zero and Scale

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起始时间 00:19Using a Balance to Compare Masses

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