Surveying
A plate parallel is the line on the plane of the negative

Perpendicular to the principal line
Along the bisector of the angle between the principal line and a perpendicular line through principal plane
Parallel to the principal line
None of these

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

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

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