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Pick up the correct statement from the following. | |
A. | the contour lines having the same elevation cannot unite and continue as one line [Wrong Answer] |
B. | a contour can not end abruptly, but must ultimately close itself not necessarily within the limits of map. [Wrong Answer] |
C. | the direction of steepest slope at a point on a contour is at right angles to the contour [Wrong Answer] |
D. | all the above. [Correct Answer] |