單項(xiàng)選擇題
A.2mm B.2.5mm C.3mm D.4.5mm
A.2mm B.3mm C.4mm D.5mm
A.1mm B.2mm C.3mm D.4mm
A.150mm B.200mm C.250mm D.300mm
A.1±0.5 B.1.5±0.5 C.2±0.5 D.2.5±0.5
A.φ7 B.φ8 C.φ10 D.φ12
A.18mm B.19mm C.20mm D.21mm