單項(xiàng)選擇題The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
A.temperature
B.density
C.deflection
D.speed
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1.單項(xiàng)選擇題When crossing a front,isobars tend to（）.
A.change from smooth curves within the air mass to sharp bends at the front
B.change from sharp bends within the air mass to smooth curves at the front
C.pass smoothly across the front with no change
D.become closer together at the front and pass through in straight lines
2.單項(xiàng)選擇題Details of coast radio stations and radar stations can be found in（）.
A.Admiralty Chart
B.Admiralty Light list
C.Admiralty List of Radio Signals
D.Admiralty Notices to Mariners
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The ISM code is part of（）.
題型：單項(xiàng)選擇題
（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.
題型：單項(xiàng)選擇題
It is dangerous for vessels without the operational radar（）the estuary.
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According to the relevant regulation, lifeboat should be powered by（）.
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A tide is called diurnal when（）.
題型：單項(xiàng)選擇題