单项选择题
What defines a great circle? （）
A.A curved line drawn on a Mercator Chart B.A course line that inscribes a loxodromic curve C.The shortest distance between any two points on the earth D.The smallest circle that can be drawn on the face of a sphere
单项选择题 The survey information upon which a chart is based is found （）.
单项选择题 The soundings on the chart are based on the depth of water available at （）.
单项选择题 The revision date of a chart is printed on which area of the chart? （）
