单项选择题
A.600 B.500 C.400 D.800
A.5mm;0.5mm B.11mm;0.6mm C.8mm;0.5mm D.8mm;0.6mm
A.8mm;0.5mm B.6mm;0.6mm C.4mm;0.4mm D.3mm;0.2mm
A.2 B.3 C.4 D.3.5
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