Reciprocal levelling eliminate the effect of:1. Errors due to atmosph – McqOptions

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1.	Reciprocal levelling eliminate the effect of:1. Errors due to atmospheric refraction2. Errors due to earth’s curvature3. Errors in staff reading4. Errors due to collimation lineWhich of these statements are correct?
A.	1 and 2
B.	2 and 4
C.	1, 2 and 3
D.	1, 2 and 4
Answer» E.

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