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解;由題目給出的條件m=100g=0.1kg和酒精的密度可計算出酒精的體積,ρ=mV得V=mρ=0.1kg0.8×103kg/m3=0.125×10-3m3=125cm3=125ml所以不用天平,只用量筒量出125ml的酒精就是100g酒精.
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