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Which of the following introduces an error of about 1 in 1000 if 20 m chain is used. | |
A. | length of chain 20 mm wrong [Wrong Answer] |
B. | one end of the chain 0.9 m off the line [Wrong Answer] |
C. | one end of chain 0.9 m higher than the other [Wrong Answer] |
D. | all the above. [Correct Answer] |