烯空气跟空气十分近似.Olefin gas closely approximates air.所有的主要难点都涌现在烯酮 ( 1 ) 的合成中.All the chief difficulties crop up in the synthesis of the enone ( 1 ).某碳氢化合物已知可能是烯烃或是烷烃.A hydrocarbon was known to be either an alkene or alkane....
他们对放热的化学反应一无所知.They know nothing about exothermic chemical reactions.他们封放热的化学反应一无所知.They exothermic chemical reactions.结果表明,燃气蒸汽联合循环系统利用了燃气侧高温吸热和蒸汽侧低温放热的特点,使得其效率高达51.The result of study shows that the exergy efficiency o...
When I asked advice, he pondered and then told me not to go.我向他请示, 他考虑了一下, 然后叫我不要去。We pondered whether to tell him.我们考虑是否要告诉他。She pondered over his words.她反复琢磨他的话。She pondered his marriage proposal for weeks.几个星期以来她认真地考虑...
Sensitivity of the week seedling to butachlor is higher than the sound one.水稻弱苗对丁草胺的敏感性高于壮苗.The article studies inductive effect of erythrocytes nucleus of the toad, Bufo gargarizans by herbicide butachlor.本文研究除草剂丁革胺对蟾蜍红...
他们中最成功的文人是朗费罗, 可是他又给我们提供了一些什么 呢 ?What has Longfellow the most successful of them all, to offer us?朗费罗能够在哈佛大学当上现代语言教授是出于幸运.Longfellow was lucky in securing a professorship of modern languages at Harvard.朗费罗也不是缺乏独创性, 不过才华不...