The first is the junior middle school literature and history professional examination: Chinese, mathematics (liberal arts), foreign languages, science and engineering majors: Chinese, mathematics (science), foreign languages.
The second is the senior high school entrance examination, which is a major in literature and history: Chinese, mathematics (liberal arts), foreign languages, history and geography; Science and engineering majors: Chinese, mathematics (science), foreign languages, physics and chemistry.
The third is the college entrance examination, and the subjects of the unified examination are all three. There are two public courses, politics and foreign languages, and one professional course. The content of the professional examination is determined according to the major of the candidates. Among them, the professional subjects are: college Chinese, introduction to art, advanced mathematics (1), advanced mathematics (2), civil law, educational theory, ecological basis and medical synthesis.
? This function is called the cumulative introduction distribution function of x, or distribution function for short.