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Synthesis of ethyl iso nicotinate using BTEAC (benzyl triethyl ammonium chloride) as phase transfer catalyst was studied.

以BTEAC(苄基三基氯化铵)为相转移催化

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Methyl 1 phenyl Propanone was synthesized with benzene and iso butyryl chloride by using anhydrous aluminium trichloride as catalyst.

由苯与丁酰氯在无水三氯化铝作催化的条件下制备苯基丙基酮。

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冷知识百科大全

ISO standards are not free, and they're not even cheap.

ISO 标免费的, 而且价格也便宜。

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TED演讲(视频版) 2023年8月合集

And once again, I go online, and I teach myself about ISO and aperture on YouTube.

我再上​​网,在 YouTube 上自学 ISO 和光圈。

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VOA Special 2020年12月合集

" It is inappropriate to report (about Pao Cai winning the ISO) without differentiating Kimchi from Pao Cai of China's Sichuan, " the statement said.

" 在将韩国与四区分开的情况下报道获得国际标化组织认证恰当的。"

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