A method of synthesis of butyl isobutyrate catalyzed by amidosulphonic acid has been studied.以氨磺酸为催化剂催化合成了异丁酸丁酯,确定了酯化优化条件.The method about synthesis of approximate straight line motion mechanism based on moving centrode ...
The hypotenuse is the longest side of a right triangle.直角三角形的斜边是直角三角形中最长的边.Compute the lengths of the hypotenuse and the other small side.计算斜边和其它小的边的长度. )Either side of a right triangle that is hypotenuse.直角边直角三角形除斜边之外的两...
这个阶段星云的大小与其质量成反比。The size of the nebula at this stage is inversely proportional to its mass.对暗星云的研究被一种新发现所推进.The investigation of dark nebulas has been facilitated by a new discovery.形成行星状星云的这一图象可能会引起许多异议.Many objections...
Security tightened in the capital in readiness for the president's arrival.首都加强了警备，准备迎接总统的到来。Britain was signalling its readiness to have the embargo lifted.英国表示愿意取消贸易禁令。Everyone has doubts about their readiness for...
Nurses are undervalued, and they never enjoy the same status as doctors.护士的作用被人们低估了，她们从未享有和医生同样的地位。Even the best teacher can feel undervalued.即使是最好的老师也会感觉受了轻视。He was in a job where he felt unappreciated and undervalued.他...
Fiona and Alastair have become patrons of the National Missing Person's Helpline.菲奥娜和阿拉斯泰尔已经成为国家失踪人口服务热线的代言人。Fiona is walking slowly as if she were tired.费欧娜慢慢走着,好象累了似的.The eldest child was a daughter called Fiona.....