Surveying
The size of a plane table is

750 mm × 900 mm
450 mm × 600 mm
300 mm × 450 mm
600 mm × 750 mm

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

level line is a curved line while hori-zontal line is a straight 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
horizontal line is normal to plumb line while level line may not be normal to the plumb line

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