单项选择题
The soundings on the imperial chart are measured in（）.
A.Feet B.Yards C.Fathoms D.Meters
单项选择题 The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
单项选择题 The short-long dashed magenta line around Gardiners Island marks（）.
单项选择题 The shoreline on charts generally represents the mean（）.
