单项选择题
A.1.5mm B.2mm C.2.5mm D.3mm
A.≤0.5mm B.≤0.6mm C.≤0.7mm D.≤0.8mm
A.≥133mm B.≥134mm C.≥135mm D.≥136mm
A.45mm B.50mm C.55mm D.60mm
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