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單項(xiàng)選擇題

From your position you observe a rotating white and green light to the north. This light is most likely（）.

A.at an airport
B.on a naval mine-countermeasures vessel
C.Block Island North Light
D.on a vessel engaged in public safety activity

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單項(xiàng)選擇題

From which type of cloud can a tornado or waterspout develop?（）

A.Nimbostratus
B.Altostratus
C.Cumulonimbus
D.Cirrus

單項(xiàng)選擇題

Freeboard is measured from the upper edge of the（）.

A.bulwark
B.deck line
C.gunwale bar
D.sheer strake