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36×24mm幻灯放映画面检验板
价格:¥0.00
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透射式投影器投影片和投影片框尺寸
Overhead projectors-transparencies and transparency frames -- Dimensions
价格:¥0.00
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36×24mm幻灯放映画面检验板
36×24mm Test target for slide projector
价格:¥0.00
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投影器 投影台尺寸
Overhead projectors-projection stages dimensions
价格:¥0.00
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