题目内容

From the numerical point of view, how many times the values of the two adjacent apertures differ

A. 1
B. 2
C. Root number 2
D. 4

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The greater the value of f, the () actual clear aperture

A. Smaller
Bigger
C. constant
D. do not know

The larger the aperture, the shallower the depth of field

The shutter generally consists of two parts, the front curtain and the rear curtain

The faster the shutter speed relative to the moving object, the more ()the moving object is.

A. Bright
B. blurry
Clear
D. dim

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