对甘油催化氢解制取1, 2- 丙二醇效果最好的是含铜的催化剂. Copper - containing catalysts are the most suitable catalysts for producing 1, 2 - propanediol through catalytic hydrogenolysis of glycerol.
Northbridge is a cool, calculating and clever criminal who could strike again.诺思布里奇是个头脑冷静、诡计多端、阴险狡诈的罪犯，他可能还会犯案。I believe I am capable of calculating the political consequences accurately.我觉得我能准确预料此事的政治后果。He described Mr ...
The painting's history has been checkered. There are nearly a hundred well - documented copies and versions of the work.这幅画的历史错综复杂,它有将近100幅证据充分的摹本和版本.She wore a checkered jumper and had ribbons in her hair.她穿着格子连衣裙，...
I don't give a toss what people think…我才不在乎人们怎么想呢。So, to be on the safe side, we subtract a penny and toss it out the window.因此，为了安全起见，我们拿掉一分钱，把它抛出窗外。Well, who gives a toss about sophistication anyway?...嗯，不管怎样，谁会在意...