这句话比较饶人，求助？ Few of the listed materials may not be permissible as such for the entire temperature range covered under the Tables and have only limited application unless additional requirements are fulfilled. 查看更多4个回答 . 5人已关注
化工专业翻译？ When achemist considers a chemical reaction, he generally asks himself threequestions: How fast is it? How complete is it? How selection is it? Somereactions are very fast and go to completion to yield a single product. Afamiliar example is the reaction of sodium and chlorine to form sodiumchloride. Other reactions, for instance the reaction of hydrogen and oxygen toform water, go very slowly at room temperature but are extremely fast at highertemperatures. They eventually go to completion to yield a single product. Mostreactions are very slow indeed. The chemist has to find ways to speed them up.If he is lucky, he can do that simply by raising the temperature (as in thereaction of hydrogen with oxygen). Unfortunately increasing the temperaturefrequently produces undesirable side effects. 查看更多2个回答 . 4人已关注
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