单项选择题

When liquid is free to move transversely in a tank，the effect is called（）.

A.free communication
B.free density
C.free surface
D.negative GM

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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

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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

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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