根据国家标准GB/T131-1993，在AutoCAD中标注表面粗糙度时应遵守下列原则： （1）表面粗糙度符号参数的尖峰总是由实体表面外部指向所标注的表面，且与该表面垂直； （2）表面粗糙度符号参数在定位之前，能动态调整，以便用户调整其位置和角度； （3）连续标注时，用户可用表面粗糙度文本参数的缺省值，也可用自定义值； （4）表面粗糙度符号参数的旋向，能保证文本参数的字头始终具有向上或向左的趋势； （5）表面粗糙度符号参数和文本参数的大小，应与全图尺寸比例协调一致。

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Mastering AutoCAD 2018 and AutoCAD LT 2018 by George Omura English | 10 Apr. 2017 | ASIN: B06Y6JZ8M4 | 1080 Pages | AZW3 | 60.76 MB 30th Anniversary of the bestselling AutoCAD reference - fully updated for the 2018 release Mastering AutoCAD 2018 and AutoCAD LT 2018 is the complete tutorial and reference every design and drafting professional needs. Step-by-step instructions coupled with concise explanation walk you through everything you need to know about the latest AutoCAD tools and techniques; read through from beginning to end for complete training, or dip in as needed to for quick reference—it's all here. Hands-on projects teach you practical skills that apply directly to real-world projects, and the companion website features the accompanying project files and other bonus content to help you master every crucial technique. This new edition has been updated to include the latest AutoCAD and AutoCAD LT capabilities, so your skills will transfer directly to real-world projects. With expert guidance and a practical focus, this complete reference is your ultimate resource for mastering this powerful software. AutoCAD is a critical skill in the design fields; whether you're preparing for a certification exam, or just want to become more productive with the software, this book will help you: Master the basic drafting tools that you'll use in every project Work with hatches, fields, tables, attributes, dynamic blocks, and other intermediate tools Turn your 2D drawing into a 3D model with advanced modeling and imaging techniques Customize AutoCAD to fit the way you work, integrate outside data, and much more If you're new to AutoCAD, this book will be your "bible;" if you're an experienced user, this book will introduce you to unfamiliar tools and techniques, and show you tips and tricks that streamline your workflow.