单项选择题
A.5% B.10% C.15% D.20% E.60%
A.1mm B.1.5mm C.2mm D.2.5mm E.3mm
A.5mm B.10mm C.15mm D.20mm E.25mm
A.1mm B.2mm C.1.5mm D.2.5mm E.0.5mm
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