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【单选题】
对全国各铁路交通枢纽的货运量等进行调查以了解全国铁路货运概况属于(    )。
A.
抽样调查    
B.
一次性调查    
C.
典型调查    
D.
经常性调查
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【简答题】光圈数值越大,光孔口径 。
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A.
萧萧
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边城
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A.
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【多选题】以下关于光圈F值的说法中,正确的是:( )
A.
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B.
光圈F值是相对孔径的倒数,通常用f标注
C.
光圈F值=焦距/镜头光孔的直径
D.
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A.
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B.
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