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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
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