The rise and fall system of calculating reduced levels of ground points in levelling work provides an arithmetical check on

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The rise and fall system of calculating reduced levels of ground points in levelling work provides an arithmetical check on

ABack sights and fore sights

BIntermediate sights

CBack sights, intermediate sights and fore sights

DBack sights and intermediate sights

Answer:

C. Back sights, intermediate sights and fore sights

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