【单选题】【消耗次数：1】
数码相机在户外摄影时，相当感光度一般设定为ISO（）。
①
A. 800
②
B.100
③
C.400
④
D.1600
参考答案：
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【多选题】
感光度的高低在胶片相机时代,不主要是由涂在胶片感光材料的（）所决定的,银盐颗粒越大的感光胶片对光线就越敏感。
①
A.银盐颗粒大小
②
B.银盐颗粒数量
③
C.感光涂层厚度
④
D.ccd感光元件
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