单项选择题
A.18mm B.18.5mm C.19mm D.20mm
A.1350mm±2mm B.1350mm±3mm C.1351mm±3mm D.1352mm±3mm
A.+15%~-15% B.+10%~-10% C.+15%~-10% D.+10%~-15%
A.1mm B.2mm C.3mm D.4mm
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