A.0.4~0.5m B.0.3~0.4m C.0.2~0.3m D.0.2m
A.52 B.16 C.18 D.34
A.航道彎曲半徑越大越好 B.航道彎曲半徑越小越好 C.航道彎曲中心角越大越好 D.航道彎曲系數(shù)越小越好