论文部分内容阅读
大面积提高中学化学教学质量的几点思考与实现
【机 构】
:
省海兴县中学
【出 处】
:
中国化学会华北首届中学化学教学及改革研讨会
【发表日期】
:
1997年期
其他文献
该文应用分层理论完全确定了磁通量方程的解空间构造,并由它的横截层S<’t><,lk>=φ,证明了它是不稳定方程。
Forest soils have high carbon densities compared to other land-uses.Soil carbon sequestration is important to reduce CO_2 concentrations in the atmosphere.An effective climate change mitigation strate
The influence of soil compaction in explaining spatial heterogeneity of different larch forest types
The effect of weeding frequency and schedule on weeding operation time: a simulation study on a sugi
This study quantified the effect of weeding frequency and weeding schedules on weeding operation time in a sugi (Cryptomeria japonica) plantation stand.A weedin