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...
Moreau took gold in the five-kilometre individual pursuit competition.莫罗在个人五公里追逐赛中获得金牌。a kilometre and a half of bitumen一公里半的柏油路面My home is half a kilometre away from here.我家离这儿有半公里....