A.60°;5m;0.7m;0.6m B.80°;6m;0.7m;0.6m C.70°;6m;0.7m;0.6m D.80°;5m;0.7m;0.6m
A.15m B.20m C.25m D.30m
A.1m B.2m C.3m D.4m