同时由于单元的自由度数不随层数的增加而增加，避免了常规三维单元在分析复合材料层板时自由度数随层数的增加而增加的弊端。
In the meantime, the number of freedom degrees doesn't increase with the number of layers in the laminate as it does in the conventional case.
通过对采用圆柱形搅拌针时垂直于焊缝方向上焊接试板温度数据的回归分析，得到了焊接试板宽度方向温度分布的二次解析式。
A quadratic polynomial describing the temperature distribution in width direction of workpieces welded with column-shaped pin was obtained by regression analyzing the experimental data.
图像的采集工作由连接到主板的US B摄像头完成，温湿度数据的采集工作由副板上的单总线温湿度传感器完成。
USB camera, which is connected to the motherboard, is used to collect image. Temperature and humidity data is collected by temperature and humidity sensor on the deputy board.
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