单项选择题
A.1/2 B.1/3 C.1/4 D.1/5
A.C25;C30 B.C20;C30 C.C30;C40 D.C20;C40
A.6 B.7 C.8 D.9
A.180-220mm B.30-50mm C.80-100mm D.60-80mm
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