单项选择题

What is an ebb current（）.

A.A current at minimum flow
B.A current coming in
C.A current going out
D.A current at maximum flow

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单项选择题

What is a lighted safe water mark fitted with to aid in its identification（）.

A.A spherical topmark
B.Red and white retroreflective material
C.A sequential number
D.A red and white octagon

单项选择题

What describes a flood current（）.

A.Horizontal movement of the water toward the land after high tide
B.Horizontal movement of the water toward the land after low tide
C.Horizontal movement of the water away from the land following high tide
D.Horizontal movement of the water away from the land following low tide

单项选择题

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