Set 4 Practice Mode

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Q11356
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What type of staff is used, if the sight are long?
Q11357
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Which levelling staff consists of three pieces?
Q11358
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How the staff should be read?
Q11359
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What is the folded length of staff, while folding staff is not in use?
Q11360
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Which levelling is the relative height of point is found out by some direct observation?