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單項(xiàng)選擇題

On navigational aids，what does the light characteristic Fl(2+1) mean?（）

A.A flashing light combined with a fixed light of greater brightness
B.Light flashes combined in groups，with a different number of flashes in each group
C.A light showing groups of two or more flashes at regular intervals
D.A fixed light varied at regular intervals by groups of two or more flashes of greater brightness

單項(xiàng)選擇題

On cargo booms，preventers are（）.

A.auxiliary guys
B.extra fair leads
C.steel bands
D.stops

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On navigational aids，what does the light characteristic Fl(2+1) mean?（）

On cargo booms，preventers are（）.

On navigational aids，what does the light characteristic Fl(2+1) mean?（）

On cargo booms，preventers are（）.