Their defense markets are too small to sustain economically viable production runs.他们的国防市场太小，就经济可行性而言不足以维持生产。The country has made enormous strides politically but not economically.该国在政治上取得了巨大的发展，但经济却跟不上去。Economically and...
Small English orchards can hardly compete economically with larger French ones.英国的小型果园很难在经济上和法国的大型果园竞争。A tunnel was not considered economically feasible.从经济上考虑，用隧道并不可行。The country has made enormous strides politically bu...
This is a generally known method for obtaining phenylnitromethane from benzyl cyanide.从苯乙腈制取苯基硝基甲烷就用这个方法.Benzyl butyrate was synthesized by using potassium bisulfate as the catalyst.以硫酸氢钾为催化剂,丁酸和苄醇为原料合成丁酸苄酯.DNA filamento...