Reduction - metathesis method for preparation of strontium carbonate from celestite is developed.提出还原 - 复分解法制备碳酸锶的新工艺.Several kinds of ruthenium - catalyzed organic reactions were reviewed: hydrogenation, oxidation, isom...
As the wave bore down on us, the trough deepened.当波涛向我们压来时, 波谷加深了.The old stone cattle trough still sits by the main entrance.陈旧的石制牛食槽仍然放在大门口。The trough of low pressure extended over about 1000 kilometres.低压槽延伸约 1,000 公里...