This engineering fill lots set two species form pulp masonry tablets stone drains, drainage ditch longitudinal slope General and subgrade longitudinal slope consistent, which form a drains end of wide 50 cm, deep 50 cm, both inside and outside side slope for 1:1 of pulp masonry tablets stone ditch; form II in after farmland paragraph block wall of drains outside side set for 30x80 cm of straight wall, ditches end of wide 50 cm, deep 50 cm of pulp masonry tablets stone ditch.
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