Qi has four basic forms: ascending, descending, exiting and entering.
气有四种运动形式：升、降、出、入。
The error mechanism of SR-CT technique is analyzed and four basic error forms are presented.
对SR - CT技术的误差进行了分析，给出了SR - CT技术误差的四种基本形式。
In this paper, the contrast error of this technique is studied, and four basic error-forms are discussed.
对该技术衬度误差的形成机理及形式进行了分析研究，并给出了四种基本误差形式。
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