單項(xiàng)選擇題

A tide is called diurnal when（）.

A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day

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單項(xiàng)選擇題

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(n)（）.

A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current

單項(xiàng)選擇題

A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is a（）.

A.Papagayo
B.fall wind
C.foehn
D.williwaw

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A tide is called diurnal when（）.

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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(n)（）.

A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is a（）.

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A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is a（）.