亚胺基杂环丙烷季铵盐的阳离子,一定是按协同反应的方式开环的.The aziridinium ions must all be opened by a concerted process.阳离子表面活性剂通常为季铵盐类.Cationics are usually quaternary ammomium salts.反 离子通常是钠, 钾和铵.The usual counter - ions are sodium, potassium an...
可生产厚层压板而不会产生裂痕。Thick sections of the laminate can be produced without the risk of cracking.该砂层单元通常为厚层或块状, 具粉砂质和碳质纹层.This sandstone unit is commonly thick - bedded and massive, with silty and carbonaceous laminations.令肌肤倍...
在医用直线加速器中通常都采用磁控管作为微波功率源.Magnetron is often used as microwave power source in clinical linac magnetron.本论文重点研究的是嵌入式系统在电子直线加速器 磁控管 频率自动跟踪控制中的应用.The AFC system of LINAC , based on the Embeded - system, is studied in the pa...
In Alberta people mine and drill for oil, potash, petrol and gas.在亚伯达,人们采矿、打井开采石油 、 碳酸钾 、 汽油和天然气.In Alberta and Saskatchewan there are many hills where dinosaur bones were found.亚伯达和萨斯喀彻温省的许多山区发现了恐龙化石.The plains of Alber...
The child kept her eyes fixed on the wall behind him.这个小女孩眼睛一直紧盯着他身后的那堵墙。They issue a fixed number of shares that trade publicly.他们发行一定数量的可公开交易的股票。We fixed for the team to visit our headquarters.我们安排了该工作组参观我们的总部。...
She paused momentarily when she saw them.看到他们，她停了片刻。Harry loosened his grip momentarily and Anna wriggled free.哈里的手稍一放松，安娜便挣脱出来。He momentarily confounded his critics by his cool handling of the hostage crisis...他对人质危机的冷静...
Ecologists argue that the benefits of treating sewage with disinfectants are doubtful.生态学家认为用消毒剂处理污水是否有益值得怀疑。Other substances used to prevent disease or infection include disinfectants and germicides.用来预防疾病或感染的其它物质有消毒剂和灭...