基本解释：闭扩张
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In this paper, we investigate extension closure of the full subcategory IkT (R) of mod-R consisting of T-k-torsionfree modules by the grade condition and strong grade condition of modules, and obtain a sufficent condition and an equivalence characterization for IkT (R) to be extension closed.本文研究了由T-k-挠自由模所构成的mod-R的完全子模范畴IkT(R)的扩张闭。
The follow-up of patients with mitral stenosis after closed mitral commisurotomy for ten years;二尖瓣狭窄306例闭式扩张术后10年随访报告
