Surveying
The nautical mile is the length of

1 minute of longitude
1 degree of latitude
1 minute of latitude
1 degree of longitude

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Surveying
The length of a chain is measured from

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

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Surveying
Accidental errors

Are generally small
Do not follow any definite mathematical law
All of these
Cannot be removed by applying corrections to the observed values

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