单选题Distance along a track line is measured on a Mercator chart by using the （）.Alatitude scale near the middle of the track lineBlongitude scale near the middle of the track lineClatitude scale at the midlatitude of the chartDlatitude or longitude scale at the middle of the scale
单选题
Distance along a track line is measured on a Mercator chart by using the （）.
A
latitude scale near the middle of the track line
B
longitude scale near the middle of the track line
C
latitude scale at the midlatitude of the chart
D
latitude or longitude scale at the middle of the scale
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