vanstone

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简单机械
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密度
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物质是由什么构成的
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期中复习（二）
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光现象单元复习 二
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光现象单元复习（一）
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物体的颜色
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眼睛和眼镜
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生活中的透镜
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探究-凸透镜成像的规律
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透镜 陈鹏伟
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光的折射
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探究平面镜成像的特点
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光的反射（）
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光的传播
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热现象单元复习 二
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热现象单元复习
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热机
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燃料的利用和环境保护
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热量 比热容
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