Surveying
The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than

None of these
0.01 second
0.0001 second
0.001 second

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

horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same
level line is a curved line while hori-zontal line is a straight line

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