Propyl glycidyl ether ( PGE ) was obtained from propyl alcohol and epichlorohydrin by phase - transfer catalysis.以环氧氯丙烷和正丙醇为原料,通过相转移催化法合成了正丙基缩水甘油醚.The FBC ( fluorous biphase catalysis ) is a new nonaqueous immobilization...
In specific acid catalysis, the undissociated acids do not contribute.在特殊的酸催化中, 不离解的酸不起作用.The corresponding reaction of acetaldehyde is subject to general base catalysis.乙醛相应的反应服从广义的碱催化.Catalysis has increased the rate o...
The committee will need to winnow out the nonsense and produce more practical proposals if it is to achieve results.委员会若要取得成果，需要摈除不着边际的观点，提出更实际的建议。winnow the chaffaway筛掉谷壳You should winnow out the inaccuracies of this pa...
山坡下面，野山羊咩咩地轻声叫着。From the slope below, the wild goats bleated faintly.一阵微风吹下山坡，使青草如波浪起伏。A gust of breeze moved down the hillside, ruffling the grass.报春花应该开始沿着陡峭的山坡一路撒播种子了。The primroses should begin to seed themselves down...
Ballpark estimates indicate a price tag of $90 million a month.大致的估计费用为每月9,000万美元。I should point out that these estimates cover just the hospital expenditures.我应该指出，这些估算仅包括医院的费用。Shares slid 11p to 293p after brokers down...
The gas contains blow - by, sludge, acids, oil, and other contaminant.这些气体包括窜缸气体, 沉积物, 酸, 机油和其它杂质的气体.Modification of rinsing techniques by installing cascading or counter - current rinse systems increases the contaminant...
这种水晶蓝晶晶的,非常漂亮.This kind of shiny blue crystal is very beautiful.以工业氧化铝 、 结合粘土 、 蓝晶石等为原料,应用聚苯乙烯球烧先注和可塑成形法研制成功了耐火隔热砖.The refractory insulating bricks were produced , taking alumina, soft clay, cyanite al as raw materials....