BTU Basic Transmission Unit 基本传输单元
Meme is the basic unit of cultural transmission and a unit of imitation.
模因是人类文化传播的基本单位，也是模仿的单位。
Abstract :A left-hand semi-circular waveguide unit was designed according to the basic principle of left-hand transmission line, a novel band-pass filter based on the unit was presented.
内容简介 ：根据异向传输线原理设计了一种半圆异向波导单元，基于该单元提出了一种新型带通滤波器。
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