单项选择题
A.4mm B.1mm C.2mm D.3mm
A.100mm,80mm B.110mm,70mm C.100mm,70mm D.110mm,80mm
A.6m,15m B.4m,20m C.6m,20m D.4m,15m
A.2m B.4m C.6m D.8m
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