利用系数矩阵和极大项，证明了这类李代数是半单李代数且没有二维交换子代数。
Using the notion of coefficient matrix and maximal element. We prove that the Lie algebra is semi-simple and it has no abelian two dimensional subalgebra.
在第二部分第一篇论文中，我们系统研究了二维非交换李代数及其全形的可解性、完备性与非半单性等性质。
In the first paper of the second part , it studies two dimensional noncommutative Lie algebra and its solvability, completeness and nonsemisimplicity and so on .
建立了叉流式热交换器在热流体和冷流体都随时间变化的条件下的动态二维数学模型。
The dynamic mathematical model of cross-flow heat exchangers is established in this paper, which takes into account of the arbitrary variations of temperature and flowrate inlets.
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