单项选择题
A.5 B.8 C.10 D.15
A.Ⅲ级 B.Ⅱ级 C.Ⅰ级 D.特级
A.0.5mm B.0.4mm C.1.0mm D.0.25mm
A.500mm B.300mm C.400mm D.600mm
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