Page 2 - PRAKTIS FOKUS SAINS 4B 焦点单元备考科学4B

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我的笔记我来做 ...................................................................... .N-1 ~ N-12

第 6 课声音

声音........................................................................................................... 1

第 7 课能

能的来源和形式........................................................................................ 5

不可更新和可更新的能源........................................................................ 9

材料
第 8 课焦点单元备考科学4B, 版权所有·侵权必究

材料的来源................................................................................................12

材料的性质................................................................................................14

第 9 课地球

地心引力...................................................................................................19
地球的转动................................................................................................21

第 10 课机械

杠杆...........................................................................................................23

简单机械和复杂机械................................................................................25

下半年评审...............................................................................................31

答案...........................................................................................................49

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