Dibenzyl sulfoxide and dibenzyl sulfone were synthesized from dibenzyl sulfide oxidated with H 2O 2 without catalyst.
Isopropenyl acetate was synthesized from ketene and acetone by direct esterification using strong acidic cation-exchange resin to substitute H2SO4 as catalyst.
Typically the green and purple sulfur bacteria live in that chemocline, enjoying the supply of H2S from below and sunlight from above.
On the condition of low temperature and normal temperature treating the seed cotton and the delinted seed cotton by H2SO4 with Carboxin.
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.
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.
Hyundai's H2 Xcient trucks have a 190 kilowatt fuel cell and seven high-pressure tanks.
H-2B visas are for seasonal non-agricultural labor.
H-2B visas are good for up to three years.
34. Agricultural employers complain about the H-2A visa for its () .
农业雇主抱怨 H-2A 签证哪一点？
But it's not just drinking straight H2O that poses a threat.
Your drinking water isn't just a pure collection of H2O molecules.
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，有别于非农业H-2B签证，后者每年只有 66000 个名额。
Hyundai Hydrogen Mobility is starting out with 50 H2 Xcient trucks but plans to put 1,600 on Swiss roads by 2025.
But colonists could use electricity to split the h2o into hydrogen and oxygen.
So how do clouds form to keep giving us the essential H2O we need?
And they spiked these exhalates with 1,000 parts per billion H2S.
That distribution gives the sensor the sensitivity it needs to detect trace amounts of H2S.
Which is about a fifth as much H2S as you'd need to have stank breath.
Water is, after all, made up of just such discrete chunks: molecules of H2O.
But neither rovers is close enough to the tundra-like Martian Poles to uncover actual frozen H2O.
H-4 visas are for husbands, wives, and children of H-1B and H-2B holders.
Scientists believe this hydrogen is attached to oxygen... H2O...water, most likely in the form of subsurface ice.
To indicate the number of atoms in a molecule, Berzelius employed a superscript notation, as in H2O.
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。
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。