商业上采用的以镍作催化剂的氢化有两种.Commercially two main types of hydrogenations are carried out with Nickel catalyst.抑制剂和促进剂能影响氢化速率.Inhibitors and promoters may affect the rate of oxxidution.用六氢化邻苯二酸酐加入到邻苯二酸酐中,可使其放热反应减慢.Exothermic reac...
进入睡眠状态时，我们的脑电波振幅慢慢变大。As we fall asleep the amplitude of brain waves slowly becomes greater.由于驱动机构的作用,使驱动端的振幅保持不变.The amplitude at the driven end is fixed by the driving mechanism.这样,即使是最强声音的位移振幅,也还是非常小的.Thus the displace...
麦凯缓缓地朝这个屏幕走来，每走一步心情都更加紧张。McKay walked slowly toward this screen, feeling a growing tenseness.从那个屏幕上看到我的脸，真让人惊愕不已。It was quite a shock to see my face on that screen!小屏幕的便携式电视机很值得买。A small-screen portable TV can be a good ...
The block is still just a skeleton of girders.这片建筑还只是仅有主梁的骨架.All girders shipped by rail were arranged on a flatbed rail car.由火车装运的所有主梁都安放在平板火车车皮上.The girders are carried on trestles.这些大梁是由支架撑着....
Everyone must be familiar with the old favourite among roses, Crystal Palace.大家一定都很熟悉玫瑰中的老牌名品“水晶宫殿”。His fans would already be familiar with Caroline.他的崇拜者们肯定已经很熟悉卡罗琳了。He does not seem to be familiar with research which m...
...the muscles of the upper back and chest.上背部和胸部的肌肉Her heart had begun to pound inside her chest like a captive animal.她心情紧张起来，一颗心在胸膛里扑通扑通跳个不停。Chest X - ray showed cardiomegaly and bilateral pleural effusion.胸部 X 光显示心脏扩...