定义符号，缩写和术语对于清楚地理解手册各部分提供的信息是必要的
A.It is necessary to define symbols, symbols, abbreviations and terminology for the dear understanding of the information presented in various sections of the Handbook. B.Define signatures, short words and jargon necessary for understanding clearly of the information contained in every section of the Handbook. C.It is important to define signs, acronyms and nomenclature for the understanding of the information provided in this section of the Handbook.正确答案A
