D623 improves water retention of fresh mortar and entrains a large amount of micro air void which causes bulk density to reduce, pore size distribution to change.
D623提高保水新鲜砂浆和夹带了大量的微空隙，这会导致堆积密度降低，孔径分布改变。
2
Although still very useful, the Pitbull can rip up air, detect stealthed units, and with the mortar upgrade - demolish buildings and infantry without breaking a sweat.
但他仍旧十分有用——它可以防空、反隐，升级了迫击炮之后，还可以轻松打击建筑和步兵。
3
The utility model relates to a pneumatic injection pump, comprising a cover board, a vessel, an air inlet, compressed air, mortar and a grout outlet.