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教案备课库《》真题及答案
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Danstudiedinhisclasssohisgradesarethebest.carefully
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—Whatdoyouthinkofournewschoolbuilding?—.Ifeelquitecomfortable.A.Iloveit. B.Idon'tmindit.C.Ican'tstandit. D.Idon'tlikeit.
小明想知道酱油的密度于是他和小华用天平和量筒做了如图所示的实验．1天平调节平衡后测出空烧杯的质量为17g在烧杯中倒入适量的酱油测出烧杯和酱油的总质量如图甲所示将烧杯中的酱油全部倒入量筒中酱油的体积如图乙所示则烧杯中酱油的质量为g酱油的密度为kg/m3．2用此方法测出的密度值会比它的真实值选填偏大或偏小．3小华认为不用量筒也能测量出酱油的密度．他进行了如下实验操作①调好天平用天平测出空烧杯质量为m0②在烧杯中装满水用天平测出烧杯和水的总质量为m1③把烧杯中的水倒尽再装满酱油用天平测出烧杯和酱油的总质量为m2则小华测出的酱油密度的表达式ρ=已知水的密度为ρ水．
完成下列单位换算7.9g/cm3=kg/m3．
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某品牌早餐奶每盒中装有的牛奶质量约为275g体积为0.25L由此可以计算出牛奶的密度为kg/m3．喝掉一半后牛奶的密度将．
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