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

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Preferred channel marks are aids to navigation which al...

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A.channel junctions
B.bifurcations
C.fishing traps
D.wrecks or obstructions

In the absence of a route leading from seaward，the conv...

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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

In regions where ice conditions prevail in the winter，（...

单项选择题In regions where ice conditions prevail in the winter，（）.

A.the lantern panes of unattended lights may not become covered with ice or snow
B.the lantern panes of unattended lights may become covered with ice or snow
C.ice or snow is likely caused colored
D.the white lights are likely caused to appear colored

沿海与大洋航行

Preferred channel marks are colored with（）．