The characteristics of planed defects in (Cr,Fe)7C3 in a chromium steel and two kinds of cast alloys have been delineate......

本文介绍了在改革开放、实行社会主义有计划的商品经济的新形势下广州市发展群众体育的新鲜经验,并提出了一些值得注意的新问题和......