一|colours(颜色)red红色orange橙色pinkgrey灰色green绿色purple紫色white白色粉色blue蓝色black黑色yellow黄色二|time(时间)brown棕色hour时day日week周year年month月午morning早上noon中night夜晚分minuteyesterday昨天today今天tomorrow明天second秒evening晚上三|week(星期)afternoon下午Sunday星期日Monday星期一Wednesday星期三Thursday星期四Friday星期五Saturday星期六Tuesday星期二四|family(家庭)father父...
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一、应用密度的计算公式及其变形公式求密度、质量和体积例:市场出售“金龙鱼”牌调和油,瓶上标有“5L”字样,已知该瓶内调和油的密度为0.92×103kg/m3,求该瓶油的质量是多少克?解:油的质量是m=ρV=0.92×103kg/m3×5×10-3m3=4.6kg二、质量相等类型计算例:50cm3的冰化成水,质量为多少克?体积为多少cm3?解:冰的质量:m冰=ρ冰V冰=0.9g/cm3×50cm3=45g水的质量和体积分别是:三、体积相等类型计算例:工厂里要加工一种...