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.
He never talked in specifics about his work.他从不谈论有关自己工作的详情。Things improved when we got down to the specifics.当我们深入到具体细节时，情况有所改观。He speaks in concepts rather than specifics.他讲话时尽用抽象概念,而不谈具体.Both have fudged their calculat...
Michael Corleone stood in front of Jack Dempsey's restaurant on Broadway and waited for his pickup.迈克尔-考利昂站在百老汇大街“杰克-代姆普瑟”饭店门前等人来接他.Airport pickup with homestay families or arrange taxi when students first arrive in...