“The fossil record continues to show that the origin of modern placental mammals postdates or is at the Cretaceous-Paleogene boundary, ” he said.
他说:“化石记录一再证实现代胎盘类哺乳动物的起源是在白垩纪-早第三纪分界点的时候或那之后。
The numerical computations have been made using difference method for difference characteristics and boundary conditions. The computation results show the state features of radon field in space.
针对模型的特点及其边界条件用差分法分别进行了数值计算,结果表明陷落柱氡气场的空间形态分布特征。
The results show that the higher-order, fast multipole boundary element method can be applied to large problems with high numerical accuracy for engineering designs.
研究结果表明,高阶快速多极边界元法易于分析此类大规模问题,并具有很高的数值计算精度,满足工程设计的要求。
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