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16mm电影放映物镜 技术条件
Technical specification of 16mm motion picture Projection lens
价格:¥0.00
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塑料、玻璃珠和金属银幕 通用工艺规范
Specification for general process of plastic、galss beaded and metallised screens
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放映银幕分类
Tne classification of projection screens
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透射放映银幕
The transmitting projection screens
价格:¥0.00
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