介绍了吩噻嗪的制备方法, 主要是二苯胺与硫在催化剂存在下反应的方法.Its preparation method, which mainly reacted by diphenyl amine and sulfur with catalyst, is introduced.本文报道了两种新的吩噻嗪衍生物的合成, 光学及其电化学性质.The synthesis, luminescence and electrochemical prope...
Economizer leakage is a main problem in running of heat recovery boiler.省煤器泄漏是余热锅炉运行中常遇到的问题.Steam pressure exploded the boiler.蒸汽的压力使锅炉爆炸了。And then advice on choosing the methods of deoxygenation of boiler water is given...
很多人在城里工作但住在四郊.Many people work in the city but live in the suburbs.我们市的四郊发展很快, 和市区的差异越来越小.Our suburb has had rapid development, and is more and more similar to the downtown area....
I descry a sail on the horizon.我看见在天水交接处的轮船.In this beautiful sunset photo, I seem to descry the wings of the angel.在美丽日落照片中, 我好像看到天使的翅膀.Learn to foster an ardent imagination; so shall you descry beauty which others unhe...