过去，某些制造商试图利用铍来建造直接辐射式高音单元穹顶。
In the past certain manufacturers have attempted to use Beryllium for the construction of a direct radiating tweeter dome.
该文介绍典型的毫米波焦平面阵列接收机，并进一步分析混频式和直接检波式辐射计接收机特性。
We describe typical focal plane array receivers, and make a further analysis on the performance of both mixer and direct detection radiometric receiver.
该文介绍典型的毫米波焦平面阵列接收机，并进一步分析混频式和直接检波式辐射计接收机特性。
We describe typical focal plane array receivers, and make a further analysis on the performance of both mixer and direct detection radiometric receiver.
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