Distance along a track line is measured on a Mercator chart by using the （）.<br>A:latitude scale near the middle of the track line<br>B:longitude scale near the middle of the track line<br>C:latitude scale at the midlatitude of the chart<br>D:latitude or longitude scale at the middle of the scale

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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