Non - basic nitrogen - containing series include pyrroles, indoles, carbazoles and benzcarbazoles.不含碱性氮的化合物包括吡咯 、 吲哚 、 咔唑和苯咔唑.Nitrogen trifluoride ( NF 3 ) is a toxic, colorless, odorless, nonflammable, oxidizing compres...
The atmosphere consist of more than 70 % of nitrogen.大气中含有70%以上的氮气.Every tonne of coal contains, on average, 30 kilograms of nitrogen.每吨煤平均含30公斤氮.The plant requires nitrogen in order to make proteins.植物需要氮以便制造蛋白质....
Conclusion: Total laminectomy destroyed the stability of lumbar spine.结论: 全椎板切除术极大破坏腰椎稳定性.Methods: Discontinous laminectomy and non - trauma incision of spinal ganglion is the main surgical technology.方法: 致压物摘除、神经根节部的无创减...
老虎悄然穿过矮树丛。The tiger prowled through the undergrowth.笼子里的老虎发出了令人毛骨悚然的吼声.The tiger in the cage gave a thrilling cry.森林里老虎数量最多.There is a preponderance of tiger in the forest....