Finally, when there were eight WDM optical input signals, using the black box model and two level model respectively, we simulated the amplified optical spectrum.
最后分别模拟放大系统采用黑盒模型和两能级模型，有八个WDM光信号输入时，放大后的光谱图。
According to the measurement principle of the stabilized heated box, two insulated model heated boxes were built in this thesis.
采用实验热箱法，作者自行制作了两个实验热箱，用来测量材料的传热系数。
A two-span continuous curved box girder model was made with Perspex.
建立一两跨连续曲线箱梁有机玻璃试验模型。
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