国立无线电技术电子学与自动化科学技术大学物理学文凭证书（证件网:ｂａｎ５８．ｃｏｍ)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.