步长指数的英文

step index

• 步长:    step; step length; ...
• 指数:    index number; inde ...
• 初生长指数:    initial growth ind ...

例句与用法

1. Numerical aperture of step - index multimode optical fibers by output far - field radiation pattern measurement
   用输出远场辐射图测量确定步长指数多模光纤的数值孔径