在练习调节教学投影仪的实践活动中小明通过调节使屏幕上出现了清晰画面．这时教室后排同学要求他将屏幕上的画面再调得大一些．为此小明的操作 Sketch Coloring Page

在练习调节教学投影仪的实践活动中小明通过调节使屏幕上出现了清晰画面．这时教室后排同学要求他将屏幕上的画面再调得大一些．为此小明的操作 Template

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tomski在练习调节教学投影仪的实践活动中小明通过调节使屏幕上出现了清晰画面．这时教室后排同学要求他将屏幕上的画面再调得大一些．为此小明的操作 coloring

在练习调节教学投影仪的实践活动中小明通过调节使屏幕上出现了清晰画面．这时教室后排同学要求他将屏幕上的画面再调得大一些．为此小明的操作 sketch template

练习调节投影仪图实践活动中小明通过调节使屏幕上出现了清晰画面但是画面超出了屏幕范围为此小明的操作应当是适当 投影仪与屏幕的 sketch template

练习调节投影仪图实践活动中小明通过调节使屏幕上出现了清晰画面但是画面超出了屏幕范围为此小明的操作应当是适当 投影仪与屏幕的 sketch template

练习调节投影仪图实践活动中小明通过调节使屏幕上出现了清晰画面但是画面超出了屏幕范围为此小明的操作应当是适当 投影仪与屏幕的 sketch template

练习调节投影仪图实践活动中小明通过调节使屏幕上出现了清晰画面但是画面超出了屏幕范围．为此小明的操作应当是适当减小减小投影仪与 sketch template

仔细观察投影仪如图所示思考投影仪的结构有何特点演示实验教师演示投影仪是如何工作的用投影仪放映投影片时将平面镜取下观察屏幕所成像 sketch template

在练习调节教学投影仪的实践活动中小明通过调节使屏幕上出现了清晰画面．这时教室后排同学要求他将屏幕上的画面再调得大一些．为此小明的操作 sketch template

投影仪是教学中常用的仪器其结构如图所示．平面镜平面镜的作用是改变光的传播方�放在投影仪上的图片在屏幕上成一个倒倒立的放大放大的实实像 sketch template

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