我国国际货代与无船承运人均实行保证金制度。

多式联运经营人在从事多式联运业务时，首先要与托运人签订多式联运合同。

公路包车运输、航空包机运输、海运包船运输三者的性质相同。

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

Which of the following heights are provided in national standards?

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.

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

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

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.