1.

The difference between a level line and a horizontal line is that

A. evel line is a curved line while hori-zontal line is a straight line
B. evel line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
C. orizontal line is normal to plumb line while level line may not be normal to the plumb line
D. oth are same
Answer» B. evel line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line


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