单项选择题
A.60mmB.80mmC.100mmD.180mm
A.300 B.250 C.200 D.100
A.2100mm B.1900mm C.2000mm D.2400mm
A.1/6~1/8 B.1/8~1/12 C.1/12~1/18 D.1/2~1/3
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