The concept of input wave impedance is introduced in order to generalize the developed theory to multi-layer medium cases.
接着引入输入波阻抗的概念，把理论推广到多层媒质的情况。
The reason that the heat-input and alloy elements decide the toughnesses of the welds is that they change the toughnesses of the regions having the lowest toughness in the multi-layer welds.
线能量、合金元素之所以改变焊缝韧性是由于它们改变了焊缝再热区中韧性最低区域的韧性。
The decomposed images are then used as the nodes on input-layer of multi-layer feed-forward network, which recognize the vehicle model on painting line.
然后把分解后的图像作为多层前馈神经网络的输入节点，对自动喷漆线上的汽车车型进行识别。
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