20(D2-D1) 15(D2-D1) 5(D2-D1) 10(D2-D1)
Answer Discuss in Comment
special maintenance period maintenance routine maintenance recurrent maintenance
20 10 40 30
upper face middle face lower case all of the above
2000kg 1000kg 8850kg 7850kg
heavy soft light hard
urban area semi-urban area rural area all of the above
random ashlar rubble square rubble
4 3 2 6
block glass ground glass coloured glass flint glass
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