Which of the following heights are provided in national standards?What are the projection properties of frontal line?A:3

According to national standard, which of the following are preferred scales?

A:3：1
B:4：1
C:2：1
D:5：1
答案: 2：1;
5：1

Which of the following heights are provided in national standards?

A:3
B:7
C:5
D:10
答案: 7;
5;
10

The symbol “GB/T 14689-2008” denotes that the concern national standard is compulsory.

A:错
B:对
答案: 错

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:对
B:错
答案: 对

Which of the following lines are used as dimension lines, extension lines, leader lines, construction lines, section lines and projection lines?

A:Wavy lines
B:Thin solid lines
C:Thin phantom lines
D:Thin center lines
答案: Thin solid lines

Which of the following are the projection rules of the projections of points？

A:The frontal projection and the profile projection of the same point should be aligned horizontally.
B:The frontal projection and the horizontal projection of the same point should be aligned vertically.
C:The horizontal projection and the profile projection of the same point have the same width coordinate.
答案: The frontal projection and the profile projection of the same point should be aligned horizontally.;
The frontal projection and the horizontal projection of the same point should be aligned vertically.;
The horizontal projection and the profile projection of the same point have the same width coordinate.

What are the projection properties of frontal line?

A:The angle between the frontal projection and axis OX equals the angle of the spacial line and the horizontal plane of projection.
B:The horizontal projection is parallel to axis OX.
C:The profile projection is parallel to axis OZ.
D:The frontal projection gives the true size.
答案: The angle between the frontal projection and axis OX equals the angle of the spacial line and the horizontal plane of projection.;
The horizontal projection is parallel to axis OX.;
The profile projection is parallel to axis OZ.;
The frontal projection gives the true size.

If a line is an oblique line, the projections of the line will be foreshortened lines in the three planes of projections.

A:对
B:错
答案: 对

The connecting line between the spacial point and its horizontal projection reflects the distance of the point to the horizontal plane of projection, and it equals the coordinate X of the point.

A:对
B:错
答案: 错

According to the difference of X coordinates of the two points, we can tell the relative position of these two points in front-rear direction.

A:错
B:对
答案: 错