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列举了公式中符号的几种类型,并论述了各种情况下符号正、斜体的使用准则;同时说明了标注黑、白体时应注意的问题。
The types of symbols in the formulas are listed, and the guidelines for the use of positive and italic symbols in various situations are discussed. At the same time, the problems that should be paid attention to when marking black and white are illustrated.