单选题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（）.Ahydraulic currentBrectilinear currentCrotary currentDharmonic current
单选题
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
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