1 and 1 filaments are usually divided into one hundred parts in mechanical dimension measurement, and the unit of length represented by one part is called a filament. A thread is 0.0 1mm, 10μ m, which is 1mm = 100 thread in our traditional length unit.
2. Mechanical workers in factories often call 1 micron, that is, 0.00 1 mm is 1 micron ... Mechanically speaking, micron is 1 μ = 1 micron =0. 1 Mi Hu = 0.00. Generally, workers who inherit technology from Northeast China and North China call Micron "um".
3, Miao surname, from the hundred surnames, but not included in the top hundred surnames. Miao's origin is very early. At present, there is a detailed record that originated in the Spring and Autumn Period and is a descendant of Qin Mugong. Posthumous title's performance of Mu Gong's call Ying was also called Gong because it should be homophonic with Mu in ancient times.
4. Silk is a commonly used Chinese character, which was first seen in Oracle Bone Inscriptions in Shang Dynasty. Its ancient glyph is like the shape of two bundles of silk. The original meaning of silk refers to the linear things spit out by silkworms, which are the raw materials for weaving silks and satins. It extends to silk, such as silk. It refers to thin threads like silk and other extremely fine things, such as silk and copper wires.
The importance of learn mathematics:
1. Mathematics is closely related to our life. To say that the real effect of learning mathematics is not reflected in exam-oriented education, but in my own thinking about the future.
2. The importance of mathematics is self-evident. Mathematics is the foundation of all sciences and an important channel to cultivate logical thinking. It can be said that every major progress of our mankind is strongly supported by mathematics.
3. The application of mathematical knowledge in life is everywhere. From the calculation of daily living costs, to astronomy, geography, quality control, agricultural economy, aerospace, there are shadows of using mathematics.