单项选择题

The Humboldt Current flows in which direction?（）

A.North
B.South
C.East
D.West

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单项选择题

The easiest way to anchor a vessel in a current is to（）.

A.stem the current and make very slow headway when the anchor is dropped
B.stem the current and be falling aft very slowly when the anchor is dropped
C.stem the current and endeavor to make neither headway nor sternway when the anchor is dropped
D.stop all headway through the water and keep the current astern when the anchor is dropped

单项选择题

The difference between the heights of low and high tide is the（）.

A.period
B.range
C.distance
D.depth

单项选择题

The current rates（）excess of 2 kn may occur with prolonged strong winds.

A.by
B.with
C.on
D.in