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