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八年级物理全册10.5机械效率（第2课时探究和测量机械效率）习题课件（新版）沪科版.ppt

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第十章 机械与人,第五节 机械效率,第2课时 探究和测量机械效率,刻度尺,钩码重G,拉力F,钩码上升的高度h,绳子末端上升的高度s,匀速,A,A,A,匀速,2.4,75%,增大,

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