單項(xiàng)選擇題A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
A.dike
B.revetment
C.cutoff
D.crib
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1.單項(xiàng)選擇題A stream of water immediately surrounding a moving vessel’s hull，flowing in the same direction as the vessel is known as（）.
A.directional current
B.forward current
C.propeller current
D.wake current
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Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
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The steady current circling the globe at about 60°S is the（）.
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River currents tend to（）.
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Which statement is TRUE concerning equatorial tides（）.
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The term flood current refers to that time when the water（）.
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The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
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Neap tides occur when the（）.
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Stand of the tide is that time when（）.
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Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
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Tide is（）in direction ENE.
題型：單項(xiàng)選擇題