其中最短命的氢氟碳化合物，被发明取代氯氟烃，制冷剂可以稀释高层空气中的臭氧层，同时也是主要的升温剂。
The most troubling of the short-lived HFCs were invented to replace chlorofluorocarbons, refrigerants that were thinning the ozone layer in the upper atmosphere, and were also a major warming agent.
当烃(典型的烷烃)的几个或全部氢被氯和氟取代而生成的化合物。
Compounds formed when some or all of the hydrogen atoms in a hydrocarbon (typically an alkane) have been replaced with chlorine and fluorine.
一项研究表明，以牙科麻醉剂“笑气”之名著称的氧化亚氮，已取代氟氯烃，成为上层大气中的臭氧最强有力的破坏物。
Nitrous oxide, better known as the dental anaesthetic "laughing gas", has replaced CFCs as the most potent destroyer of ozone in the upper atmosphere, a study has shown.
硅正逐步取代从诸如特氟隆或PU其他聚合物管的手术仪器植入的药物输送系统。
Silicone is gradually replacing tubing from other polymers such as Teflon or PU in surgical instrumentation to implantable drug-delivery systems.
本发明涉及新的特别由三氟甲基和卤素取代的1，3-二苯基脲，以及它们在药物组合物的制备中作为活性成分的用途。
The invention relates to novel specifically trifluoromethyl and halogen substituted 1,3-diphenyl ureas and their use as active ingredients in the preparation of pharmaceutical compositions.
本发明涉及一种含氟原子和氰基的取代偶氮苯羧酸酯类液晶化合物及其制备方法。
The present invention relates to one kind of substituted azophenyl carboxylate containing fluorine atom and cyan group as liquid crystal compound and its preparation process.
本发明涉及一种含氟原子和氰基的取代偶氮苯羧酸酯类液晶化合物及其制备方法。
The present invention relates to one kind of substituted azophenyl carboxylate containing fluorine atom and cyan group as liquid crystal compound and its preparation process.
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