A.2.0;1.8 B.1.8;2.0 C.1.8;1.8 D.2.0;1.6
A.1 B.3 C.6 D.2
A.5 B.2 C.1 D.3
A.20mm B.30mm C.40mm D.50mm
A.9.0m/s B.20m/s C.15m/s D.10.0m/s