单项选择题
A.Land first sighted when vessel approaching from seaward B.Land last sighted when vessel leaving from a port C.In sight of one another when vessel underway D.In sight of an island during a ship on her voyage
Preferred channel marks are colored with（）．A.black and ...
单项选择题Preferred channel marks are colored with（）．
A.black and green bands B.red and green bands C.red and yellow bands D.yellow and green bands
Preferred channel marks are aids to navigation which al...
单项选择题Preferred channel marks are aids to navigation which all following marks other than（）．
A.channel junctions B.bifurcations C.fishing traps D.wrecks or obstructions
In the absence of a route leading from seaward，the conv...
单项选择题In the absence of a route leading from seaward，the conventional direction of buoyage generally follows（）.
A.an anti-clockwise direction around land masses B.a clockwise direction around land masses C.an anticlockwise direction around sea masses D.a clockwise direction around sea masses
