In section 2, we study the qualitative property and give all parametric representations of phase orbits for the unperturbed system.
第二节研究了未扰动系统的定性性质并给出了所有相轨道的参数表示。
LNG demand imported from other country in future is forecasted by adopting the method combining qualitative analysis with quantitative analysis in the forth section.
第四章采用定性与定量分析相结合的方法，预测我国LNG未来的进口量。
LNG demand imported from other country in future is forecasted by adopting the method combining qualitative analysis with quantitative analysis in the forth section.
第四章采用定性与定量分析相结合的方法，预测我国LNG未来的进口量。
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