单项选择题

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
D.tide cycle

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The Humboldt Current flows in which direction?（）

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

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

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

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