急……!做俯卧撑是省力杠杆还是费力杠杆?
急……!做俯卧撑是省力杠杆还是费力杠杆?
物理人气:811 ℃时间:2020-02-03 05:53:33
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动力点在手臂,阻力点在重心,支点在手掌,费力杠杆
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