The two-peg test in the adjustment of a dumpy level employs the principle that

equal lengths at back sight and fore sight do not affect the difference in level.

reciprocal levelling eliminates errors of non-parallel instrument and collimation axes.

two readings from the same station will minimize errors in bubble tube axis.

correction is made for verticle axis at one peg and for horizontal axis at the other peg.

Inheritance is the principle that

knowledge of a general category can be applied to more specific objects

classes with the same name must be derived from one another

C++ functions may be used only if they have logical predecessors

one function name may invoke different methods

maintaining uniform nutrients concentration

maintaining continuous flow of nutrients

maintaining constant volume of culture medium

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