20.用天平和量筒测石块的密度�用调节好的天平称石块 的质量把石块放在天平的左盘当右盘内有50ɡ的砝码一 个游码标尺的位置如图7 3甲 Template




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tomski20.用天平和量筒测石块的密度�用调节好的天平称石块 的质量把石块放在天平的左盘当右盘内有50ɡ的砝码一 个游码标尺的位置如图7 coloring