A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.<br>A:hydraulic current<br>B:rectilinear current<br>C:rotary current<br>D:harmonic current

A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.
A:hydraulic current
B:rectilinear current
C:rotary current
D:harmonic current

出自：海船船员证

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