In chapter 2, center condition and bifurcation of limit cycles of quasi cubic system are I.
第二章研究了一类拟三次系统的中心条件与极限环分支问题。
This paper discuss the locally topological structure of higher order singular point for the plane cubic system in the first critical case and give a criterion by the coefficients of polynomials.
讨论了第一临界情形下的平面三次系统高次奇点的局部拓朴结构，并给出利用多项式系数的判断准则。
The Siemens system, by contrast, consumes only 1.8kwh per cubic metre, and the firm hopes to get that down to 1.5kwh.
然而，西门子的系统每立方耗能1.8 kWh就能达到效果，该公司希望降至1.5 kWh。
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