单项选择题
A.600~400mmB.200~100mmC.100~60mmD.400~200mm
A.400~200mmB.800~400mmC.>400mmD.>800mm
A.80~60mmB.60~40mmC.100~80mmD.40~20mm
A.400~200mmB.600~200mmC.800~400mmD.400~300mm
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