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

以BTEAC(苄基三乙基氯化铵)为催化剂合成了烟酸乙酯。

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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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leatherleaf, leather-lunged, leathermeal, leathern, leatherneck, leatheroid, leatherware, leatherwear, leatherwood, leather-wood,

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3G, 401(K), a,

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冷知识百科大全

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

ISO 标准不的, 而且价格也不宜。

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TED演讲(视频版) 2023年8

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

我再次上​​网,在 YouTube 上自学 ISO 和光圈。

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leave no sort of trace, leave no stone unturned, leave of absence, leave off, leave office, leave out, leave sb alone, leave sb behind, leave sth out, leave-breaker,

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3G, 401(K), a,
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