单项选择题
A.管型 B.圆型 C.扁形 D.方型
A.2m B.3m C.4m D.5m
A.25mm³4mm~40mm³4mm B.20mm³4mm~40mm³4mm C.15mm³4mm~40mm³4mm D.10mm³4mm~40mm³4mm
A.2~4mm B.5~7mm C.8~10mm D.12~14mm
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