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英语例句库

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)为相转移催化剂酯。

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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剂的条件下制备苯基丙基酮。

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3G, 401(K), a,

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原声例句
冷知识百科大全

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

ISO 标准不是免费的， 而且价格也不便。

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TED（视频版） 20238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 202012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.

" 在不将韩国泡菜与四川泡菜区分开的情况下报道泡菜获得国际标准化组织认证是不恰当的。"

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3G, 401(K), a,
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