In theory, risk investment cycle is determined by marginal added-value and marginal cost of projects.
理论上，风险投资周期由项目边际增加值和项目边际成本共同确定。
In the middle-late stages of production, as the deepening of the oil field development, the marginal operation output decrease, the cost increases, and the investment increase, too.
在油田开采中后期，随着油田开发程度的加深，措施作业边际产量递减，措施作业边际费用递增，措施作业增量边际成本递增。
Results The marginal seating of the casting without ring investment had significant difference compared with the castings with ring investment ( P< 0.05).
结果无圈包埋组铸件的边缘适合性与有圈包埋组相比有显著性差异（P< 0 .0 5 ）。
Results The marginal seating of the casting without ring investment had significant difference compared with the castings with ring investment ( P< 0.05).
结果无圈包埋组铸件的边缘适合性与有圈包埋组相比有显著性差异（P< 0 .0 5 ）。
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