Copper - containing catalysts are the most suitable catalysts for producing 1, 2 - propanediol through catalytic hydrogenolysis of glycerol.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....
They sparred for a moment, on the brink of a full fight.他们互相推搡了一会儿，眼看就要大打出手了。Over the years he sparred with his friend Jesse Jackson over political tactics.这些年以来，他一直跟他的朋友杰西·杰克逊为政治手腕的问题争论不休。They had always gotten along, e...
He has been a meticulous manager, a manager par excellence.他是个十分细心的经理，出类拔萃的经理。It became difficult to promote excellence without being accused of elitism.提倡追求杰出难免被指责为宣扬精英论。Bresson is par excellence the Catholic film-maker...