Draw a solid line if you can see it, and a dotted line if you can't see it. For example, draw a cube, or some 3D graphics (there is always a hidden side, so if you want to express its outline, use a dotted line).

Auxiliary lines must be drawn as dotted lines. Auxiliary lines, as the name implies, are used to help solve problems. Because we don't know this term, we haven't touched this knowledge point yet. Take your time, you will learn. When doing application problems, some problems are given pictures, but you can't work out the answer just by giving pictures, so we need to use auxiliary lines. (The auxiliary line primary school will mention that it will teach how to apply it, and junior high school will study it in detail. )

There are also requirements in algebra, very few cases, almost none. Comparatively speaking, geometry is the most.

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1. If the candidate's solution is different from this solution, you can make corresponding scoring rules with reference to this scoring standard.

2. When the examinee answers incorrectly in a certain step, which affects the subsequent part, if the answer after the step does not change the content and difficulty of this question, the score of the latter part can be determined according to the degree of influence, but it shall not exceed half of the score of the latter part; If there is a serious mistake in the answer after this step, no extra points will be given.