1, a needle type in which short needles protrude at right angles from a line composed of main needles, and its formation is similar to winding.

2. Both structural grid and unstructured grid are used for numerical calculation, in which polar coordinates are used for structural grid and Cartesian coordinates are used for unstructured grid.

3. Dalong Stamp 1 is a silver horizontal double toothless sample ticket with right-angled edges, which is rare and of high quality.

4. Lying on your side with your arms outstretched and forming a right angle with your body is called "missing". People who sleep in this position may be suspicious and cynical.

5, the center line is not right angle virtual buried spiral bevel gear.

6. In a multistage pump, the flow path from the impeller to the guide vanes in the housing is divided by a disk-shaped member arranged along a plane substantially at right angles to the main shaft.

7. These semicircles, arcs, rectangles, squares, isosceles trapezoids and congruent right triangles are all plans of mathematical geometry, which just corresponds to the assertion that "Luo Shu initiated mathematical geometry" put forward by mathematicians at home and abroad.

8. The potential of the tree is moderate, the branches are relatively open, the branches are straight, the angle is appropriate, and the tree body is easy to manage.

9. For example, the horizontal line problem parallel to one side of a right triangle leads to a quadratic equation; Cubic equation appeared when discussing the volume of prism.

10, R&D personnel said that the lower pressure makes the shape design of the natural gas storage device more room, and it can be designed as a thin-walled, right-angled light gas tank, which is attached to the bottom of the car and does not occupy the space inside the car.

1 1, right triangle and Euclid norm.

12, in the process of planing, check the planing progress at any time according to the baseline just drawn, and check whether it is square with a combined ruler.

13 In addition, more than 10 right-angled animal fossils with the most complete body in the world were discovered for the first time, thus ending the inference that the head of this animal fossil only has an imaginary picture and restoring its true colors.

14. The expressions of these results in rectangular coordinate system are also given and discussed.

15. For each belt, select the point near the center as the origin. According to the shape of the belt, choose equiangular cone projection or equiangular transverse cylindrical projection. On this basis, the rectangular coordinate network is formed and the reference system is established.