单项选择题
An electronic depth finder operates on the principle that（）.
A.radio signals reflect from a solid surface
B.sound waves travel at a constant speed through water
C.radar signals travel at a constant speed through water
D.pressure increases with depth
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相关考题
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单项选择题
An ECDIS is required to display which information?（）
A.Water temperature
B.Climatology data
C.Speed of advance
D.Depth contours -
单项选择题
An ECDIS is required to display which information?（）
A.Soundings
B.Waypoints
C.Meteorological data
D.Radar targets -
单项选择题
An ECDIS is required to display which information?（）
A.Radar targets
B.ARPA vectors
C.Hydrographic data
D.All of the above
