单项选择题
The movement of water away from the shore or downstream is called a(n)（）.
A.reversing current
B.ebb current
C.flood current
D.slack current
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The interval of the average elapsed time from the meridian transit of the moon until the next high tide is called the（）.
A.harmonic constant
B.establishment of the port
C.half-tide level
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单项选择题
The Humboldt Current flows in which direction?（）
A.North
B.South
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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
