泡沫驱与常规的化学驱方法相比具有更好的封堵性能，是非常有前途的三次采油方式。利用泡沫体系驱油时，油相以乳化油滴的方式分散于泡......

Porosity is a main defect in aluminum alloy castings, which is also thought to be severe in aluminum alloy castings prod......