This paper focused on the diversity and discrepancy of musical understanding from these asects:the materials of music, the indirect nature of musical reflection, the patterns of musical express and the different subjects of musical esthetic appreciation.

Parameter Optimization and Inference Solving for Models Based on Modelica;

By virtue of lemma,the paper puts forward several kinds of curvilinear integral\'s solution structures,utilizes property of derivative and differential equation demonstrate the existence of its solution,educes simpler solve theorems and gives applications,which make up for shortage of the document.