Surveying
Sensitiveness of a level tube is designated by

length of level tube
radius of level tube
None of these
length of bubble of level tube

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

reading both verniers and taking the mean of the two
taking mean of several readings distributed over different portions of the graduated circle
taking both face observations and taking the mean of the two
double sighting

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