1. A metal element, which is widely used in industry, can be used to make steel and various instruments, and is also an indispensable substance in organisms.
2. Hard description: ~ fist. ~ the army. ~ ride. Brother Jin ~ Ma. ~ Han. ~ hooves. ~ wrist.
3. The description is firm: ~ clank. ~ discipline. ~ certificate.
4. describe integrity: ~ selflessness.
5. Describe a serious expression: He always looks sad.
6. Black: ~ Li. ~ green.
7. Name of weapon: hands-free ~.
8. Last name.
1, limonite
Sentence: At present, pyrite, magnetite, pyrrhotite and limonite have been found to be special minerals with practical application value, which are formed by H2S in oil and gas reservoirs and ferrous in sedimentary strata.
Description: One of the major iron mines. Brown or yellowish brown, grape-like, block, etc.
2. Ductile iron
Sentence: Because of its good anti-collision performance, thermal and physical properties, chemical plants and petrochemical enterprises have long been particularly fond of using ductile iron.
Explanation: A kind of cast iron, in which a certain amount of magnesium or magnesium alloy is added to molten iron, the flake graphite in the structure becomes spherical, thus greatly increasing its strength, toughness and ductility. Mainly used to replace steel castings of heavy machinery and agricultural machinery.
3. Ferrite
Sentence: Similarly, we should also simulate some old and new epoxy coatings filled with ferrite, and use 4 mm thick carbon fiber epoxy resin composite matrix to simulate aircraft skin.
Description: A new type of magnetic material sintered from oxides. Because of low eddy current loss and simple process, it is widely used in radio technology. Also called magnetic porcelain.
4. Iron ring
Sentence: daniel craig plays Zach Lonergan, a gunman in Arizona from 65438 to 0875. He woke up in the desert with a mysterious iron ring on his wrist, and his memory disappeared.
Description: The toy is a ring made of thin iron bars with a diameter of about 50 cm. Push forward with a special iron hook when playing: roll ~.
5. Pyrite
Sentence: Under the selected technological conditions, the rich gold in calcium carbonate deposits and some gold associated with pyrite and galena are exposed, which is beneficial to the recovery of gold.
Description: Mineral, composed of iron disulfide, is golden yellow with high hardness and unilateral conductivity. Sulfur dioxide can be released when heated at high temperature, which is an important raw material for extracting sulfur. Chinese medicine is called native copper.
6. Magnetite
Sentence: Cather? Thomas? The NASA research team led by KathieThomas-Keprta found discoid carbonate and tiny magnetite crystals in this meteorite.
Description: One of the main iron ores, the composition is ferroferric oxide, which is gray-black and strongly magnetic.
7. Hematite
Sentence making: Because size is very important. Emphasis is placed on ultra-large actuators, and hematite crystal bars are beautified with jets. This black pleated sheepskin actuator is fashionable, young and bold. Carry it with attitude.
Description: One of the main iron ores, the composition is iron oxide, which is earthy red and magnetic. Besides ironmaking, it is also used as a grinding material for pigments and lenses.
8, iron core
Sentence: In order to accurately locate the multi-point grounding fault of transformer core, two detection methods, high frequency method and traveling wave method, are proposed and analyzed in detail.
Make up your mind: ~ Nong | This time, he made up his mind.
9, iron core
Sentence: In order to accurately locate the multi-point grounding fault of transformer core, two detection methods, high frequency method and traveling wave method, are proposed and analyzed in detail.
Make up your mind: ~ Nong | This time, he made up his mind.
10, cycad
Sentence-making: This shows that Ginkgo biloba and Cycas may have adopted different strategies when adapting to the environment in the process of evolution. They may not be directly related, but they develop in parallel on their respective evolutionary routes.
Description: Evergreen tree, with leaves clustered at the top of stem, large pinnate compound leaves, strip-shaped glossy leaflets, terminal flowers, dioecious, male flowers conical, female flowers with brown fluff and spherical seeds. It grows slowly in warm areas. Commonly known as cycad.