中国石油大学（华东）
第一章单元测试
A compass is used to draw circles and arcs
Thick dashed line shown can be made surface-treatment
Continuous thin irregular line to indicate part sectional boundary lines or to terminate a part view, and for short break line.
Thin dashed dotted line to indicate axis line ,symmetrical center lines.
The elements of the dimension
The main contents of title block are:
The "R" and "∅ " means radius and diameter.
The possible direction of a dimension text should towards?
What does a thick line represent in drawing?
A:错 B:对
答案:对
A:错 B:对
答案:对
A:对 B:错
答案:对
A:错 B:对
答案:对
A: dimension line B: arrow head C: text D: extension line
答案: dimension line### arrow head### text### extension line
A:signature B:student ID NO. C:class D:part name
答案:signature###student ID NO.###class###part name
A:对 B:错
答案:对
A:upper B:down C:right D:left
答案:upper###left
A:represent invisible line B:represent hatching line C:represent visible line D:represent symmetrical line
答案:represent visible line
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