A thermal relief is used on plane layers for thru-hole components to make soldering and desoldering easier.
限热槽通常用于直插元件的内电层以利于焊接和拆焊。
The model simulating thunderstorm cell by means of three layers plane charged disk, the calculations for thundercloud electrostatic field use mirror method.
该模型采用三层平面布置的带电圆盘来模拟雷云空间，雷云静电场的计算采用镜像法。
Results show that polymer flooding can improve the producing reserves effectively, extend the plane sweep efficiency, reduce the difference between layers and balance the in-layer vertical producing.
结果表明，聚合物驱可有效地提高油层的动用状况，扩大平面波及系数，减小层间差异，使层内纵向动用更加均匀。
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