[英语作文开头结尾经典句型]一 、开头万能公式： 1.开头万能公式一：名人名言 原理：我们看到的东西很多都是创造出来的，包括我们欣赏的文章也是，所以尽管编，但是一定要听起来很有道理。 经典句型：A proverb says...+阅读

冰融化成水后，体积是变小！ 水的密度是 1.0g/立方厘米 冰的密度是 0.9g/立方厘米 100立方厘米的冰则为90g 90g的水体积肯定小于100立方厘米 水的密度1g/cm3 冰的密度0.9g/cm3 M=PV 1-水结成冰体积增加10%： 设一定质量的水体积为V，则其质量为1*V=V 当它结冰以后，质量不变仍为V，但是由于冰的密度改变，所以结冰后体积改变，体积为 冰（水）质量/冰密度=V/0.9 所以冰的体积比水的体积增加了 V/0.9-V=1/9*V 约等于0.1V 即增加了10% 2-冰融化成水时 设一定质量的冰体积为V，则其质量为0.9V 当它融化以后，质量不变仍为0.9V，但是体积改变为 冰（水）质量/水密度=0.9V/1=0.9V 所以融化以后体积比冰的减少了 V-0.9V=0.1V 即减少了10%

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