第一章 Basic Knowledge of Engineering Drawing：This chapter is about basic knowledge of engineering drawing for further studies. Contents in this chapter include national standards related,drawing tools and their utilization, and basic techniques in drawing geometrical construction.1.1Course introduction:As a common language of engineering,the drawing is used to direct the production and make the technical interchange.It is a carrier of engineering and product information and the communication language in engineering and industry.[单选题]What does a thick line represent in drawing?选项:[represent visible line, represent invisible line, represent symmetrical line, represent hatching line]
1.2Related Provision:Engineering drawing is an important documentation used during the process of design and manufacturing. For the sake of convenience in communication, all drawings should comply with the national standards. National standards are abbreviated as GB with a code.
[单选题] Thin dashed dotted line to indicate axis line ,symmetrical center lines.选项:[对, 错]
[单选题] Continuous thin irregular line to indicate part sectional boundary lines or to terminate a part view, and for short break line.选项:[对, 错]
[多选题]The possible direction of a dimension text should towards?选项:[left, right, down, upper]
[单选题]The "R" and "∅ " means radius and diameter.选项:[错, 对]
[多选题] The elements of the dimension选项:[ arrow head, dimension line, extension line, text]
[多选题]The main contents of title block are:选项:[student ID NO., part name, class, signature]
[单选题] Thick dashed line shown can be made surface-treatment
选项:[对, 错]
[单选题] A compass is used to draw circles and arcs选项:[对, 错]
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