A study on inner city infill housing design in shanghai .
上海内城填充式住宅设计研究。
Sodium infill valves are not a new concept , but in the past they have been extremely costly to build .
中空充钠气门并不是一个全新的概念，但是过去他们造价高昂。
One of the crucial issues in reservoir engineering study is how to choose pattern well spacing in order to reach the highest recovery and optimal economic efficiency by waterfooding process for field development project designing and well pattern infill or adjustment .
