This paper compile the rare-earth elements and Nd isotope data for lunar pristine rocks from investiga-tions in recent years. Using these data, we compared the
Currently many methods of implementation are available if we want the courseware to be used in e-learning interactivly with media rich.This paper focuses the at
The upper and middle reaches of the Taoer River, a representative ecologically sensitive area, has experienced great cli-mate change and rapid agricultural and