laser cutting短语¹³¹⁶²⁰⁺³ 基本例句 激光切割 By means of the finite element method, the unsteady-state temperature fields were gained by numerical calculating in the process of laser cutting with high energy density and moving spot heat source. 应用有限元法，数值求解了激光切割这种高能流密度、移动点热源所形成的非稳态温度场，得到了激光切割石油筛管过程的传热规律。 cnki