Construction Planning and Management
The part of a derrick crane include
(i) Mast
(ii) Boom
(iii) Bull wheel
(iv) Jackwhich of these statements are correct?

(ii), (iii) and (iv) are correct
(i), (ii) and (iii) are correct
(i), (iii) and (iv) are correct
(i), (ii) and (iv) are correct

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Construction Planning and Management
At a work site, statistical quality control of concrete means

Applying the theory' of probability to sample testing or inspection
Measurement of risks to eliminate failures
Reduction in costs for the removal of defects
Reduction in wastage of inspection costs

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