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Dibenzyl sulfoxide and dibenzyl sulfone were synthesized from dibenzyl sulfide oxidated with H 2O 2 without catalyst.

在无催化剂条件下利用过氧化氢氧化二苄基硫醚合成了二苄基亚砜和二苄基砜。

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Isopropenyl acetate was synthesized from ketene and acetone by direct esterification using strong acidic cation-exchange resin to substitute H2SO4 as catalyst.

以乙烯酮和丙酮为原料,用强酸性离子交代替浓硫酸作为催化剂,接酯化合成乙酰丙酮的乙酸异丙烯酯。

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Typically the green and purple sulfur bacteria live in that chemocline, enjoying the supply of H2S from below and sunlight from above.

绿硫菌与紫硫菌通常会生活在化变层,同时享受下方源源不绝的硫化氢与上方充足的阳光。

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On the condition of low temperature and normal temperature treating the seed cotton and the delinted seed cotton by H2SO4 with Carboxin.

在适和温度条件下,用卫福,华农,多菌灵,适时乐四种种衣剂对棉种的毛籽和硫酸脱绒籽进行处理。

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Methods Certain amounts of and Zn were put into the wastewater to produce hydrogen (H2) and the H2 reacted with S2-to form H2S, and sulfuret was separated from the wastewater.

方法在废水样加入一定量的浓硫酸和锌粒,生成H2,利用H2和S2-结合生成H2S,以分离硫化物。

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Co-gasification of Huainan coal, waste wood and waste polyethene (PE) to produce fuel gases with high H2 was carried out on a fluidized bed reactor in out laboratory.

开展了利用煤、废木屑和聚乙烯废料进行共气化以制备富氢燃料气的研究。

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VOA慢速英语_科技

Hyundai's H2 Xcient trucks have a 190 kilowatt fuel cell and seven high-pressure tanks.

现代H2型卡车有190千瓦燃料电池和7个高压油箱。

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VOA Special 2020年6月合集

H-2B visas are for seasonal non-agricultural labor.

H-2B签证适用于季节性非农业劳工。

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VOA Special 2020年6月合集

H-2B visas are good for up to three years.

H-2B签证有效为3年。

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考研英语阅读真题(汇总)

34. Agricultural employers complain about the H-2A visa for its () .

农业雇主抱怨 H-2A 签证哪一点?

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科学洞察双语版

But it's not just drinking straight H2O that poses a threat.

但危险不仅仅来自于直接喝

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Your drinking water isn't just a pure collection of H2O molecules.

饮用并不是纯粹H2O分子集合物。

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考研英语阅读真题(汇总)

The H-2A visa has no numerical cap, unlike the H-2B visa for nonagricultural work, which is limited to 66,000 a year.

H-2A 签证没有数量限制,有别于非农H-2B签证,后者每年只有 66000 个名额。

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VOA慢速英语_科技

Hyundai Hydrogen Mobility is starting out with 50 H2 Xcient trucks but plans to put 1,600 on Swiss roads by 2025.

现代氢动力初生产50辆H2 Xcient卡车,但计划到2025年在瑞士道路上增加1600辆。

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科学世界

But colonists could use electricity to split the h2o into hydrogen and oxygen.

但是殖民者可以将电解成氢气及氧气。

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科普小杂文

So how do clouds form to keep giving us the essential H2O we need?

那么,云是如何形成并持续提供我们所呢?

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科学60秒 2018年12月合集

And they spiked these exhalates with 1,000 parts per billion H2S.

他们在袋子里呼出气中加入了十亿分之一千浓度硫化氢。

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科学60秒 2018年12月合集

That distribution gives the sensor the sensitivity it needs to detect trace amounts of H2S.

这种分布方式让传感器拥有了检测微量硫化氢所灵敏度。

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科学60秒 2018年12月合集

Which is about a fifth as much H2S as you'd need to have stank breath.

而五倍这种浓度硫化氢才会产生口臭。

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经济学人-科技(The Economist-Science and technology)

Water is, after all, made up of just such discrete chunks: molecules of H2O.

由离散粒子即H2O分子构成。

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美国历史频道纪录片《宇宙》

But neither rovers is close enough to the tundra-like Martian Poles to uncover actual frozen H2O.

然而两个漫游者都没有靠近火星极地冻土带去揭示实际冻结

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VOA Special 2020年6月合集

H-4 visas are for husbands, wives, and children of H-1B and H-2B holders.

H-4签证适用于H-1B和H2B签证持有者配偶和子女。

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寻找火星生命

Scientists believe this hydrogen is attached to oxygen... H2O...water, most likely in the form of subsurface ice.

科学家认为氢附着于氧.....H2O... ,极可能以在地下以冰形式存在。

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万物简史

To indicate the number of atoms in a molecule, Berzelius employed a superscript notation, as in H2O.

为了表示分子里原子数量,伯采留斯使用了一种上标方法,如H2O。

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Scishow 精选系列

Mmmm, a refreshing glass of cold water, and if you think I'm talking about H2O, then you're right.

嗯… … 一杯清凉。如果你认为我要谈谈,那你对了。

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考研英语阅读真题(汇总)

One survey found that bureaucratic delays led the average H-2A worker to arrive on the job 22 days late.

一项调查发现,官僚延误导致持 H-2A 签证务工人员到岗时间平均推迟 22 天。

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