顾名思义，晶体管常用作混频器，可以输出混频信号，并且是许多电子通讯系统的基本元件。
As the name suggests, mixers produce output signals with mixed frequencies and are fundamental components of many electronic communications systems.
尽管经济增长率很高，老挝仍是一个基础建设相当原始的国家，没有铁路，只有一个落后的公路系统和十分有限的国内外电子通讯。
Despite this high growth rate, Laos remains a country with a primitive infrastructure; it has no railroads, a rudimentary road system, and limited external and internal telecommunications.
课程包括：电力系统，90分；讯号处理，88分；系统控制，92分；电力能源系统，92分；固体电子学，88分；通讯，94分。
Curriculum included: Electric power systems, 90; Signal processing, 88; systems and control, 92; Electric energy systems, 92; Solid-state electronics, 88; Communications, 94.
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