Which of the following introduces an error of about 1 in 1000 if 20 m chain is used

Question:Which of the following introduces an error of about 1 in 1000 if 20 m chain is used

1. length of chain 20 mm wrong

2.one end of the chain 0.9 m off the line

3.one end of chain 0.9 m higher than the other

4.all the above.


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