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1.三大化学肥料:N、P、K。2.三种黑色金属:铁,锰,铬。3.三大矿物燃料:煤,石油,天然气。4.使铁生锈的三种物质:铁,水,氧气。5.物质的三种状态:固态,液态,气态。6.常见的三种强酸:盐酸,硫酸,硝酸。7.不带电的三种微粒:分子,原子,中子。8.浓配稀的三个步骤:计算,量取,溶解。9.酒精灯的三个火焰:内焰,外焰,焰心。10.构成物质的三种微粒:分子,原子,离子。11.构成原子的三种微粒:质子,中子,电子。
1. Three chemical fertilizers: N, P, K 2 three kinds of ferrous metals: iron, manganese, chromium. Three major fossil fuels: coal, oil, natural gas. 4. Iron rusty three substances: iron, water, oxygen. Three material states: solid, liquid, gaseous. 6. Common three kinds of strong acids: hydrochloric acid, sulfuric acid, nitric acid. Uncharged three kinds of particles: molecules, atoms, neutrons. 8. Concentrated dilute three steps: calculation, measurement, dissolved. 9. Alcohol lamp three flame: inner flame, outer flame, flame heart. 10. The three kinds of particles that make up a substance: molecules, atoms, ions. 11. Constitute three atoms of atoms: protons, neutrons, electrons.