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....
The polymer film's hydrophile was test with contact angle machine.利接触测试仪该聚合膜性.No poison. no taste, pollution and inorganic metal, a chemical property stable, good hydrophile.为无毒、无味 、 无污染的无机非金属材料, 化学性质稳定, 具有良好的亲水性.Th...
The rate constants of radical and electrophilic addition to alkenes are dominated by different factors.烯烃的自由基加成和亲电加成速率受不同的因素控制.These should be four undetermined constants in the displacement function.位移函数中应有四个未定常数.Some w...
还设计了另一种系统,它能够间歇地发送瞬间脉冲.Still another system is designed to send out transient pulses intermittently.狂风间歇地席卷火星上的尘云.Violent winds periodically drive clouds of dust around Mars.在稍高一些的流速时,个别的颗粒沿着河床间歇地滚动和滑动.At some higher vel...