1) the second mining
二次采矿
1.
： The article analyzes the second mining＇s technique and economy of old diggings； and introduce the method and practice of two diggings； one is Chinese and the other is oversea
对老矿山的二次回采作了一些技术经济分析，并介绍了国内外两座矿山二次采矿的方法和成功经
2) Secondary oil recovery
二次采油
1.
OGRT,The recovery efficiency of an oilfield is determined by the development means from this point,the paper introduces the main characteristics of primary oil recovery,secondary oil recovery and tertiary oil recovery that represent various development means.
油田的开发方式决定着油气采收率的高低，该文从这个高度出发，阐明了一次采油、二次采油和三次采油的本质特征，认为它们分别代表了不同的油田开发方式。
3) secondary thermal recovery
二次热采
4) secondary gas recovery
二次采气
6) secondary mining
二次开采
1.
On the regularity of surface rock movement caused by secondary mining in Huangxian coal field;
黄县煤田二次开采地表岩移规律探索
补充资料：输出反馈(见线性二次型次优控制)
输出反馈(见线性二次型次优控制)
output feedback
3h日c卜口fon以以{输出反馈型次优控制。(output王eedbaek)见线性二次
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条