1, pronunciation
Yellow hair girl.
Step 2 explain
The third place in heavenly stems is often used to indicate the third place in order or rank. Flame. Last name.
3. Word formation
A, B, C, D: the top one to the top four in the ancient heavenly stems sorting. Refers to the order of things or the general outline of things.
C: the third subject of the senior high school entrance examination. Then it refers to the third place in the exam.
Acetone: Also known as acetone and dimethyl ketone, it is an organic compound with chemical formula C3H6O, relative molecular weight of 58.08, density of 0.792 g/cm3 and melting point of -94.7℃.
Appearance is colorless and transparent liquid, sweet, volatile and flammable, soluble in water, alcohol, ether, chloroform, acetylene, oil and hydrocarbons, but also soluble in grease and rubber, and can react with substances such as reduction, oxidation, halogenation, addition and polymerization.
C-word sentence
1, acetone is a common organic solvent, which is widely used to dissolve plastics, resins and other materials. In the plastic industry, acetone is usually used to make plastic products, such as containers, pipes and films.
2. As an excellent organic solvent, acetone is widely used in chemical experiments. It can be used to extract and separate various organic compounds, such as aliphatic compounds, aromatic compounds and alcohols.
3. Acetone is a colorless transparent flammable liquid with special odor and toxicity. It is an organic compound and belongs to one of ketones. Acetone is a liquid at room temperature, which is volatile and irritating.
In some industries, acetone is used as cleaning agent and diluent. For example, in the manufacture of electronic and optical instruments, acetone can be used to clean lenses and electronic components and remove grease and dirt.
In the medical field, acetone is sometimes used as an anesthetic, but it is rarely used now. In the past, acetone was used as an anesthetic for oral treatment. However, it is no longer widely used because of its toxicity and irritation.