前言近年Olsen氏的NaHCO3测定土壤有效磷的方法不仅在我国东北、西北和华北等地的中性及石灰性土壤上广为流传应用,而且在上海、浙......

一群G叫CLT群,如果它满足Lagrange定理的逆定理:对d_,G,G有d阶子群。 CLT群是一类介于超可解群和可解群之间的一类群。到今为止,CL......

Raising cattle in feedlots is becoming more common in Argentina, but there is little information available about the eff......

To observe the availability of phosphorus by different extraction methods in some cultivated soils of Hathazari Upazilla......