Based on the Poisson bracket and the discriminant of integral of motion, we prove the problem that the moment of momentum is the integral of motion when the mass point is affected by central force.

运用泊松括号，依据运动积分判别式，证明了质点受有心力作用时，其动量矩是运动积分的问题。

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Central Jilin urban agglomeration is regarded as an important territory where we can solve the bubble problem of urbanization level and transfer surplus rural labor force.

吉林省中部城镇群是吉林省解决城市化水平虚高和转移大量农村人口的重点地区。

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