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單項(xiàng)選擇題

Of the following,（）is not a wind.

A.bora
B.gust
C.gregale
D.floe

單項(xiàng)選擇題

Risk of collision may be deemed to exist（）.

A.if the compass bearing of an approaching vessel does not appreciably change
B.even when an appreciable bearing change is evident, particularly when approaching a vessel at close range
C.if you observe both sidelights of a vessel ahead for an extended period of time
D.All of the above