该包装袋西装范围广泛，适合于多层复合。单层pe, PP等由薄膜和纸张制成的预制袋。
The packing bag suits in extensive range, suit for multi-layer compound. Monolayer PE, PP and so on preformed bag made by film and paper.
为了求解复合材料多层扁壳在初始薄膜力时的强迫振动，在直接积分法中加入了迭代步骤，推导出了相应的公式和计算步骤。
The iterative method is added into direct integral method to analyze forced vibration problem of laminated composite shallow shells while the relative formulas are derived.
应用推荐