单项选择题
A.5-10mm B.10-15mm C.15-20mm D.20-25mm
A.5-10mm B.10-15mm C.10-20mm D.20-25mm
A.80% B.90% C.70% D.75%
A.15~20mm B.5~10mm C.8~13mm D.10~15mm
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