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大家在搜：视准轴管水准器圆水准器塔尺制动螺旋复合透镜水准路线地球位数高程异常正常重力线

竖丝

网络vertical hair

竖丝

1

重点研究了Ra数和竖丝间距对自然对流换热量的影响。

The effects of Ra and the distance between the vertical wire were studied .

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