A.one black ball B.two cones with bases together C.a cone,apex downward D.two cones,apexes together
A.an anchor light B.sidelights and a sternlight C.three lights in a vertical line,the highest and lowest being red,and the middle being white D.None of the above
A.vessels ascending the river B.vessels descending the river C.all vessels ascending and descending the river D.None of the above