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140314
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光學
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安黃
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Apr 23, 2013, 11:30:18 PM
4/23/13
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to feynm...@googlegroups.com
140314 為甚麼A'B' 等於12 ?
它也沒給弧度!!
討論區板主
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Apr 24, 2013, 8:06:47 AM
4/24/13
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您好;
A'B'為凹面鏡邊緣直徑,題目有說「一凹面鏡邊緣為直徑12公分的圓」
安黃於 2013年4月24日星期三UTC+8上午11時30分18秒寫道:
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