There are many cultural things and lifestyles I don’t quite understand when watching American TV series recently. . 1.Why does the name John Smith seem so fake to Americans? 2Why is it difficult to buy air tickets with cash in the United States... Show all The following points should be noted about the usage of Et al. (Latin et alia, meaning "and others"): When a paper has more than two or three authors (depending on the citation format) and is cited in the text, et al. can be used. I have looked for similar materials before, but could not find a suitable classification for the Chinese version. The English version of the recommended catalog of life (link is wiki introduction, in English), official website address: home | catalog of life. Latest (2017) classification.
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Regarding the smith chart, please note: (1) the smith chart is a planar view of the reflection coefficient; (2) the impedance in the chart is the normalized impedance. Any point in the Smith chart corresponds to a certain normalized impedance and reflection coefficient.
