Question

write about contar line​

Answer 1

Answer:

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. Acontour map is a map illustrated withcontour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

Explanation:

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Answer 2

Answer:

Control lines are always used for hardware control. While they have an important role, the logic level detected on the control lines or generated on them are not transmitted to the control PC; they are not sourced by the control PC either.