One book is also called "heavy book" because many years ago, all colleges and universities with enrollment had similar labels, either 985, 2 1 1, or provincial key universities. The word "heavy book" is taken from the main point, so there is "heavy book" The first line of college entrance examination results refers to the first batch of undergraduate admission scores, and most of the institutions are key universities (key universities are the original meaning of distinguishing universities), so the first line is also called the key line. At present, there is no so-called key line, only the first, second and third lines.

The first and second lines of the college entrance examination refer to the enrollment batches of the national unified examination for enrollment of ordinary colleges and universities. The college entrance examination admission score line is also called provincial control line or batch line. Each province has a different name and the same meaning. The so-called college entrance examination admission line refers to a fractional line that candidates must pass if they want to go to a number of universities. Generally speaking, the admission line of a university is called the key line; The admission lines of two universities are called two lines; The admission lines of the three universities are called the three-line or undergraduate line.

Each province that implements batch enrollment will draw a batch control line and several batches will draw several lines. For example, undergraduate courses are divided into three batches, and there will be one line, two lines, three lines and specialist lines. A batch of undergraduate courses will only have undergraduate lines and specialist lines. On the one hand, the function of underlining is to give you a reference when filling in your volunteers, on the other hand, it also clearly divides the boundaries of volunteers. For example, offline candidates cannot fill in their volunteers. Of course, the last batch of candidates can fill in the next batch of volunteers.