A.φ80 4mm B.φ108 4mm C.φ50 3mm D.φ150 4mm
A.φ80 4 mm B.φ108 4mm C.φ50 3 mm D.φ150 4 mm
A.3.14 m/s B.1.77m/s C.2.56 m/s D.5.08 m/s