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How about nitrogen education? Ask for an introduction.
As far as my personal experience is concerned, this nitrogen guide is good. I belong to the second kind? War, the first time I applied to other institutions, I didn't even get into the interview, and then I was very unhappy. Choosing nitrogen for the second time obviously made me feel different. Their teacher is very strict. During the whole preparation process, I was firmly supervised and I didn't slack off. And I carefully analyzed every knowledge point, so I passed the exam for the second time.