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