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增焦距镜
安装在摄影镜头光路中,可使该摄影镜头的焦距值成倍率(如1.4×、2×、3×)增大的附属镜。为倍率镜的一种。又称增倍镜、增距镜。
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National Mentally Handicapped Education Experience Exchange Conference
National Meteorological Centre
National Meteorological Information Certer
National Metrology Centre for Energy(Aerospace)
National Metrology Institute
National Metrology Institute of Japan
national migrant workers training plan
national mineral database
National Mining museum, Rumelange
National Missile Defense
National Mississippi River Museum & Aquarium
National Mobilization in Suppression of Communist Rebellion
National Mobilization Law
national monitoring network of ecological environment
national moral
National Motor Vehicle Driver Information Database
National Mukden Higher Teacher School
national multipurpose investigations of the coastal zone and tidal wetland resources
National Municipal League
National Museum
National Museum,Bloemfontein
National Museum, New Delhi
National Museum of Afghanistan
National Museum of African American History and Culture
National Museum of African Art
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