單項選擇題

What area of the earth cannot be shown on a standard Mercator chart（）.

A.Equator
B.Areas including both North and South latitudes
C.North and South Poles
D.A narrow band along the central meridian

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單項選擇題

Traffic separation schemes adopted by the IMO are listed in（）.

A.NM
B.Ship's Routing
C.Colreg
D.Solas

單項選擇題

The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.

A.Set
B.Frequency
C.Period
D.Function