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外语
Which of these weights is required to balance the scales, 90 kg, 128 kg or 160 kg?
Which of these weights is required to balance the scales, 90 kg, 128 kg or 160 kg?
admin
2012-01-09
14
问题
Which of these weights is required to balance the scales, 90 kg, 128 kg or 160 kg?
选项
答案
128kg
解析
根据杠杆平衡原理,动力×动力臂=阻力×阻力臂,用代数式表示为F×L1=W×L2,所以80×160=?×10,从而可得出结果。
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本试题收录于:
D类竞赛(专科)题库大学生英语竞赛(NECCS)分类
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D类竞赛(专科)
大学生英语竞赛(NECCS)
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