A.3km;20km/h B.2km;40km/h C.3km;40km/h D.2km;20km/h
A.140kPa B.100kPa C.170kPa D.50kPa
A.100KPa;10km/h B.100KPa;5km/h C.50KPa;10km/h D.50KPa;5km/h