This paper discuss the locally topological structure of higher order singular point for the planecubic 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。
2
A 25.12 centimetres of the column basal plane circumference, is high 24 centimetres, cuts it into a maximal cone, cuts cubic centimeter volume number going to.
一个圆柱的底面周长25.12厘米，高24厘米，把它切成一个最大的圆锥，切去的体积多少立方厘米。
3
A method of calculating crystal plane spacing in centered cubic structure is proposed, and several examples are given to verify the validity of this method.