Glyoxylic acid was rapidly synthesized by catalytic oxidation of glyoxal with H 2 O 2.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.Glyoxal is prepared with waste liquid propellant HNO 3 - 27 S and ethanal.利用报废的液体推进剂硝酸-27S和乙醛制备乙二醛.There a...
Great attention must be paid to linking theory with practice.必须十分注重理论联系实际.She stayed with them, linking arms with the two girls, joking with the boys.她跟他们呆在一起，与两个女孩手挽手，和男孩子们开着玩笑。Arrangements were well advanced for linkin...
The thinking is good-hearted, but muddled and fundamentally unsound.这个想法的出发点是好的，但是条理混乱，而且本质上是错误的。The national tests were educationally unsound.从教育角度看，全国统考是不合理的。The church was structurally unsound.那个教堂的结构很不坚固。...