单项选择题
Which information is found in the chart title（）.
A.A rhumb line appears as a straight line B.Distance is measured at the midlatitude of the track line C.Meridians appear as curved lines converging toward the nearer pole D.Parallels，except the equator，appear as curved lines
单项选择题 Which information does the outer ring of a compass rose on a nautical chart provide（）.
单项选择题 Which chart symbol indicates the bottom is clay（）.
单项选择题 Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
