3.如下图所示在杠杆的两端分别挂着质量相同的铜球和锌球这时杠杆平衡.然后将两球分别浸没在稀h2so4和cuso4溶液中一段时间. 1 Template




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tomski3.如下图所示在杠杆的两端分别挂着质量相同的铜球和锌球这时杠杆平衡.然后将两球分别浸没在稀h2so4和cuso4溶液中一段时间. 1 coloring