The machine directly winds the primary coil on the rectangular enclosed voltage transformer core, which is originated by our institute.
该机可在矩形封闭的电压互感器铁芯上直接绕制一次线圈，为我所之首创。
Numerical calculations have been made for wave-guides with a core of rectangular cross-section embedded in a uniform surround of lower refractive index.
对于掩埋在较低折射率的均匀介质中的距形截面芯子的波导曾作过数值计算。
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