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- The synthetic methods of pyrocatechol were introduced.The main production method at present is phenol hydroxyl hydrogen peroxide method, and some advice was put forward. 介绍了邻苯二酚的合成方法,目前其主要的生产方法为苯酚过氧化氢羟基化法,并提出了一些发展建议。
- Water contains hydrogen and oxygen. 水含有氢和氧。
- Water is composed of hydrogen and oxygen. 水由氢和氧组成。
- hydroxyl hydrogen 羟基氢
- Water is composed of the elements hydrogen and oxygen. 水是由氢元素和氧元素组成的。
- An organic compound in which the hydrogen of the hydroxyl group of methyl alcohol is replaced by a metal. 甲基化产物一种有机合成物,是甲醇的羟基中的氢被一种金属取代
- The hydroxyl ion has a negative charge. 氢氧根离子有一个负电荷。
- Water may be resolved into hydrogen and oxygen. 水可以分解为氢和氧。
- Containing two hydroxyl radicals. 二羟基的包含两个羟基的
- Having only one hydroxyl group to react with acids. 一元酸的只有一个可与酸发生反应的氢原子团的。
- Polyvalent Metal Hydroxyl Complexes. 多价金属羟基络合物;
- The hydrogen is the known the lightest element. 氢是已知的最轻的元素。
- Hydroxyl has an extremely oxidizing nature. 氢氧基具有极强的氧化特性。
- Hydrogen and oxygen combine/Hydrogen combines with oxygen to form water. 氢与氧化合成水。
- A molecule of water consists of two atoms of hydrogen and one atom of oxygen. 水分子含有两个氢原子和一个氧原子。
- Water can be dissolved into hydrogen and oxygen. 水能分解成氢和氧。
- Both hydrogen and oxygen are elements. 氢和氧都是化学元素。
- Hydrogen is a one-valence element. 氢是一价的元素。
- Water is a compound of hydrogen and oxygen. 水是氢和氧的化合物。
- This metal acts on water to set hydrogen free. 这种金属作用于水,就释放了氢气。