The variety of equation type and multiple spike type were more economic than weighty spike type under general production condition, and easily got high and stable yield.
但在目前的生产条件及生产水平下则是以均衡型、多穗型品种较为经济，且易获得高产稳产。
The theory of minimum entropy production or minimum rate of energy dissipation shows that a river is stable when it is in a relative equilibrium condition.
最小熵产生原理或最小能耗率原理保证了河流在相对平衡状态的稳定性。
The stable production of the specialty P240 for tubing with large diameter was realized under the condition of low melt flow index.
大口径管材专用树脂P240实现了低熔体流动指数下的平稳控制。
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