is a route established for convenience of ship navigation, often marked with center-line buoys.(1.0)
A.Separation zone or line B.Recommended route C.Roundabout D.Precautionary area正确答案B
is a route established for convenience of ship navigation, often marked with center-line buoys.(1.0)
A.Separation zone or line B.Recommended route C.Roundabout D.Precautionary area正确答案B