A.crossing your course in the same direction
B.crossing your course in opposite directions
C.parallel to the pier from ahead
D.setting you on the pier
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A.Directly in line with the bow
B.Side by side，with their lines on the port and starboard side
C.So that their lines form an angle
D.On top of one another
A.They occur when the Sun is at minimum declination north or south
B.They occur when the Moon is at maximum declination north or south
C.The difference in height between consecutive high or low tides is at a minimum
D.They are used as the basis for the vulgar establishment of the port
A.They occur only at quadrature
B.They occur when the Moon is nearest the Earth
C.They cause diurnal tides to become mixed
D.They have a decreased range from normal
A.South Atlantic
B.South Equatorial
C.Agulhas
D.Guinea
A.Falkland Current
B.Brazil Current
C.Norway Current
D.Benguela Current
最新試題
The velocity of the current in large coastal harbors is（）.
The tide is（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
You are anchoring in a river where the current is from one direction only.The best way to lay out two anchors is to have them（）.
A wave entering（）is likely to produce bores．
River currents tend to（）.
The set of the current is the（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
The two most effective generating forces of surface ocean currents are（）.