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标准灰板的反光率为 _( )_ 。夜景人物纪念照所用闪光灯指数(GN)为24,如果人物离相机距离为4米,拍摄时应选用的光圈为 ( )_ 。

时间：2021-09-03 15:07 关键词：文鼎教育乐山师范学院商业摄影

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18%@#@f/6

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