A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refraction
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A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
A.the time of day
B.the seasons
C.geography
D.All of the above
A.sphere
B.oblate spheroid
C.spheroid of revolution
D.oblate eggoid
A.air gap
B.freeboard
C.penetration
D.water depth
A.range of tide
B.height of tide
C.charted depth
D.actual water depth
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The height of tide is the （）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
During daylight savings time the meridian used for determining the time is located farther （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
Areas enclosed by a long and short dashed magenta line indicate （）.
The meaning of ebb tide is that （）.
A pilot vessel on pilotage duty shall show identity lights （）.
Clearance gauges at bridges indicate （）.
During a period of whiteout，you should expect which of the following（）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.