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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 | |