单项选择题
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
An ECDIS is required to display which information?（）A.W...
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
An ECDIS is required to display which information?（）A.S...
A.Soundings B.Waypoints C.Meteorological data D.Radar targets
An ECDIS is required to display which information?（）A.R...
A.Radar targets B.ARPA vectors C.Hydrographic data D.All of the above
