单项选择题
A.0.5m B.0.7m C.1m D.1.2m
A.0.5%，10mm B.0.3%，5mm C.0.5%，5mm D.0.3%，10mm
A.≥20mm B.≥30mm C.≥40mm D.≥50mm
A.0.9 B.1.05 C.1.2 D.1.5
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