• 然而取代氯氟,包含塑料制冷剂中的臭氧亲和物质——氟氯化碳(HCFs氟氯HFCs),同样也是强大的温室气体

    However, the ozone-friendly substances that have replaced CFCs in plastics or as refrigerants - hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) -- are also powerful greenhouse gases.

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  • 公司“18.30”工程成功实现精制工艺取代工艺,达到了预期目标。

    Replacing the process of copper liquor wash with methanolizing and alkylating was successful in "18·30" project in our company.

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  • (典型)几个全部取代生成化合物

    Compounds formed when some or all of the hydrogen atoms in a hydrocarbon (typically an alkane) have been replaced with chlorine and fluorine.

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  • 本文报道络合物烷基化加成,合成取代,产率较高。

    This paper reports the route of synthesis multisubstituted alkenes by addition reaction of alkyne zirconalkylation with zirconocene complexes.

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  • 2-H苯并咪唑盐与为不饱和取代格利雅试剂的加成-水解反应进行了研究,将此反应应用不饱和制备

    The addition-hydrolysis reaction was applied to the synthesis of unsaturated aldehyde by the -reaction of 2-H benzimidazolium iodide with alkenyl magnesium bromide.

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  • 项研究表明,以牙科麻醉剂笑气之名著称氧化亚氮,取代,成为上层大气中的臭氧强有力的破坏物。

    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.

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  • Q 1取代饱和饱和5-或6-元

    Q1 represents optionally substituted, saturated or unsaturated 5- or 6-membered hydrocarbyl, etc.

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  • 一个多个氢原子原子取代

    Chlorinated hydrocarbon a hydrocarbon in which one or more hydrogen atoms are replaced by chlorine atoms.

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  • 介绍了环氧化学反应取代反应开环反应。

    Two reactions of epichlorohydrocarbon that is opening-ring and substitute reaction were introduced, at the same time, some kinds of medication made from epichlorohydrin were introduced .

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  • 介绍了环氧化学反应取代反应开环反应。

    Two reactions of epichlorohydrocarbon that is opening-ring and substitute reaction were introduced, at the same time, some kinds of medication made from epichlorohydrin were introduced .

    youdao

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