单项选择题
A.≥30mm B.≥10mm C.≥50mm D.≥25mm
A.15~20mm B.20~30mm C.10~20mm D.15~25mm
A.≤140mm B.≤150mm C.≤180mm D.≤160mm
A.≥2m B.≥2.1m C.≥2.2m D.≥2.5m
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