單項選擇題假設監(jiān)視用攝像機離被監(jiān)視物體的水平距離為5000mm,被監(jiān)視物高度為5000mm,像場高度為100mm,則攝像機鏡頭的焦距應為()

A.200mm
B.100mm
C.25mm
D.5mm


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