九年级组

图片内容：载人飞船返回地球过程中，穿过大气层时与大气剧烈摩擦，产生大量的热量；着陆前再打开降落伞来减速，最终安全着陆（模拟图）

图片内容：串联电路的电流处处相等

素材应用：串联电路的电流特点。

图片内容：并联电路的干路电流等于各支路电流之和

素材应用：并联电路的电流特点。

图片内容：并联电路的支路电流与支路电阻成反比

素材应用：欧姆定律、并联电路的特点。

图片内容：电源短路时，电路中电流过大，容易烧坏电源

素材应用：短路。

图片内容：楼梯灯控制演示

素材应用：电流与电路。

图片内容：楼梯灯开关是怎样控制电路的

素材应用：电流与电路、电路设计。

楼梯灯开关控制电路的原理：

上楼时，按下楼下开关，开关由2拨向3，此时楼梯灯电路为通路，灯亮；上楼后，按下楼上开关，开关由6拨向5，此时楼梯灯电路断开，灯熄灭。

下楼时，按下楼上开关，开关由5回到6，楼梯灯电路再次接通，灯亮；下楼后，按下楼下开关，开关由3回到2，楼梯灯电路断开，灯熄灭。

图片内容：病房呼叫演示

素材应用：串联与并联电路。

图片内容：病房呼叫原理电路图

素材应用：串联与并联、电路设计。

八年级组

图片内容：天舟三号货运飞船与空间站完成对接

素材应用：运动和静止的相对性。

▲倒车雷达

▲回声定位

▲B超

▲声呐

图片内容：水中倒影

素材应用：光的反射、平面镜成像

图片内容：影子1

素材应用：光的直线传播

图片内容：影子2

素材应用：光的直线传播

图片内容：影子3

素材应用：光的直线传播

图片内容：眼睛看近物时，晶状体变厚，折光能力变强

素材应用：眼睛与眼镜。

图片内容：眼睛看远物时，晶状体变薄（平），折光能力变弱

素材应用：眼睛与眼镜。

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俟飘伏2413有没有好的平面设计的素材网站推荐?
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俟飘伏2413好的平面设计网站有哪些? -
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俟飘伏2413哪里有免费的平面设计素材网 -
卫翰亭17118941475 ______ 千图网,昵图网都有免费的哦,不过有数量限定一天内.

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俟飘伏2413有哪些免费的平面设计素材网站 最好是PSD CDR的了 -
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