| 释义 |
〔base〕A substance that provides a pair of electrons for a covalent bond with an acid.共价化合物:能够提供一对电子给一个酸形成共价键的化合物〔refrigerant〕A substance, such as air, ammonia, water, or carbon dioxide, used to provide cooling either as the working substance of a refrigerator or by direct absorption of heat.致冷剂:能够提供空气、氨、水或二氧化碳等冷却的物质或可以用作电冰箱工作物质的一部分或可以用于直接吸热 |