Surveying
The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

True horizon
All of these
Celestial horizon
Rational horizon

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Surveying
The length of a chain is measured from

outside of one handle to inside of other handle
outside of one handle to outside of other handle
inside of one handle to inside of other handle
centre of one handle to centre of other handle

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