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Surveying
Which of the following introduces an error of about 1 in 1000 if 20 m chain is used
length of chain 20 mm wrong
one end of the chain 0.9 m off the line
one end of chain 0.9 m higher than the other
middle of the chain 0.45 m off the line
all the above.
Correct Answer:
all the above.
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