第一章测试1.According to national standard, which of the following are preferred scales?
A:2：1 B:5：1 C:4：1 D:3：1
答案:AB
2.
Which of the following lettering heights are provided in national standards?
A:3 B:7 C:10 D:5
答案:BCD
3.The symbol "GB/T 14689-2008" denotes that the concern national standard is compulsory.
A:错 B:对
答案:A
4.When we make a drawing, a frame should be drawn inside of the outmost edges of the drawing sheet. There are two styles of drawing sheet layout: with a filling margin and without a filling margin.
A:错 B:对
答案:B
5.Which of the following lines are used as dimension lines, extension lines, leader lines, construction lines, section lines and projection lines?
A:Thin solid lines B:Wavy lines C:Thin center lines D:Thin phantom lines
答案:A
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