The unified examination subjects of postgraduate entrance examination shall be centralized and unified. Self-propositional subject papers are generally propositioned by professional tutors in colleges and universities, and also marked by teachers in relevant departments of colleges and universities; Generally speaking, the heads of provincial and municipal examination institutes are responsible for marking the unified examination subjects, and the marking teachers are called to a unified place for closed marking.

Since 20 12, the marking of public * * * courses for postgraduate entrance examination is divided according to the students' sources, and the specialized courses are divided according to the schools that apply for it.

The marking working group is generally divided into the following six groups and their respective responsibilities.

Manual marking group: responsible for marking subjective questions of all unified examination subjects;

Machine marking and grouping: responsible for objective test papers of all unified examination subjects, and for score entry, proofreading and data processing;

Review group: responsible for the review and grading of subjective test papers;

Test paper scheduling group: responsible for receiving, sorting, distributing, recycling and keeping test papers;

Discipline inspection team: responsible for the discipline inspection and supervision of all aspects of marking work;

Logistics Support Group: responsible for logistics support and safety during marking.

Second, the online marking process

Since 20 13, all subjects of the national postgraduate examination have been marked online, and the whole process of marking has been recorded on the spot.

Online marking is to scan students' test papers into electronic versions and store them in the system. Among them, the objective questions are automatically marked by machine-readable cards, and the subjective questions are automatically identified and graded by the machine, and the marking teacher logs in to the designated computer system for marking.

Third, the detailed marking steps.

In the future, Yi Yun will make every effort to conduct online marking in strict accordance with the marking standards for the postgraduate entrance examination, so as to be as close to the truth of the marking as possible!

The following is the three-step marking process of Yi Yun Future Mathematics Marking Group.

1, analysis+training: analyze problems and various problem-solving methods to determine standard answers. Determine 3-5 scoring points for each question (which can be adjusted according to the overall difficulty of the test paper and the overall answer of the students) and corresponding scores (often including key formulas/substitutions/intermediate results, etc.). ), determine the typical mistakes that can't be scored (often including L'H?pital's misuse/lack of intermediate process/self-imposed conditions when proving problems, etc.). ), and training marking group teachers;

2. Trial approval: try to revise several papers, determine the scoring point, grasp the tightness, and unify the marking scale;

3. Formal correction: the corresponding score is given according to the score points, and the system automatically adds:

Correcting a topic often ends in a few seconds, which is fast;

Familiar with the use of the answer sheet, no offside, no string writing, no scribbling, no defacing and folding;

Pay attention to the practice of roll paper writing, be neat and recognizable, and the conclusion should be prominent.

Don't circle the answer, just write it at the end or conclusion, which will not affect the neatness of writing and the extraction of other scoring points;

Don't omit key steps to ensure logical integrity and smooth derivation.

Marking rule

1, first calculate the problem to see if the answer is correct, give full marks if there are no typical mistakes, and give points according to the main points if they are wrong.

There are many methods to calculate the limit/integral, and the scores are given according to key steps, such as substitution/infinitesimal substitution/Taylor, etc.

There are limit/integral calculation questions in the topic, and points are given according to the calculation results of this part. The integral class can be scored according to whether the image/column formula (integral limit+integrand function) is correct, and the calculation process is complicated, so it needs to be scored according to the requirements of the previous step.

Pay attention to the direction of curve and surface integral, and there is no directional deduction 1-2, and distinguish different representations of surface, line and body;

If you draw the right picture, you can score; If you don't draw, you can get 0 points; If the painting is wrong, you can get 0 points. , as shown in the figure below:

2. The proof questions are graded according to the key steps, which generally includes judging whether the definition function/median theorem selection/variable differentiation/variable definition domain is correct.

The writing of proof conclusion accounts for 1-2 points.

3. Other questions (non-calculation and non-proof) first look at whether the answer is correct, give full marks if there are no typical mistakes, and give points according to the main points if they are wrong.

4. Write the domain of attention of infinite series+write/explain the attention constant c in the general solution of differential equations/equations;

The score is wrong. Yes, deduct 1-2 points.

For other types of questions (fields are not required), it cannot be accurately judged that fields cannot be written. If the domain name is misspelled, deduct 1-2 points.

See clearly whether to seek the convergence radius or the convergence region, and don't reinvent the wheel.

5. Some topics can be scored:

High number:

Proof classes: related mean value theorem formula, related power series formula, disproof (assuming first), assuming that the required conditions are established, writing part of the process+directly writing conclusions or small conclusions;

Calculations: Taylor expansion, infinitesimal substitution, derivative (multiple), integral substitution/substitution, partial integration, symmetry;

Other categories: substituting results, assuming the required conditions are established, derivative definition, derivation (multiple/molecule is set as a new function for derivation), Lagrange multiplier method, arc length/Gauss/Green and other related formulas, plane/straight line/slope expression, convergence radius of power series, common expansion of power series, derivative/integral of power series summation item by item, first-order linear differential equation formula and characteristic equation;

Line generation: the process of finding the eigenvalues of the matrix, writing a quadratic matrix, and finding the eigenvectors according to the eigenvalues.

Probability: when it is proved that two-dimensional randomness is not independent, you can choose any combination with unequal probability; Write the convolution formula of two-dimensional function distribution, the probability density/probability distribution of eight commonly used distributions, and the formula of digital characteristics; Write the maximum likelihood function when seeking the maximum likelihood estimate.

Principle: Concept/formula of knowledge points related to topic investigation+logic skip proof+substitution value+self-added condition (when it cannot be solved)

6. Scribbled writing leads to no result, and the score is regarded as no result. If the result is incorrect, if the key step is not found, the score is wrong.

The answer is correct, but the overall handwriting is not clear. Deduct 1-2 points.

7. There are at most two small questions in the postgraduate entrance examination, and there are basically no three small questions. Pay attention to identify the second question that is not affected by the result of the first question.

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The overall marking of the postgraduate entrance examination is extremely strict and the marking speed is very fast. Please pay special attention to the standard of answering questions, otherwise you will easily make mistakes or get low marks.

I wish everyone the first place in the 2020 postgraduate entrance examination!