在催化剂存在下,用双氧水氧化乙二醛溶液快速合成了乙醛酸.Glyoxylic acid was rapidly synthesized by catalytic oxidation of glyoxal with H 2 O 2.利用报废的液体推进剂硝酸-27S和乙醛制备乙二醛.Glyoxal is prepared with waste liquid propellant HNO 3 - 27 S and ethanal.乙二醛 、 乙...
You must put in an appearance, at least, or she'll think you're avoiding her.至少，你必须露一下面，否则她会认为你在躲避她。Avoiding mosquito bites is easier said than done.防蚊叮咬好说难做。We are learning how to confront death instead of avo...
A man of moral integrity does not fear any slanderous attack.人正不怕影子斜.Her slanderous words soiled his reputation.她的毁谤损害了他的名誉.He makes slanderous statement about the prime minister on television.他在电视上讲话诽谤首相....
Daytime television tended to remind her too forcefully of her own situation.日间电视节目往往使她深刻地认识到自身的境况。He argued forcefully and convincingly that they were likely to bankrupt the budget.他坚持认为他们可能会突破预算，而且理由非常有说服力。She denied th...
The main copper minerals are malachite, chrysocolla, little chalcopyrite, chalcosine and even little bornite and covellite.矿石主要含铜矿物为孔雀石 、 硅孔雀石, 少量的黄铜矿 、 辉铜矿及极少量的斑铜矿和铜蓝等....