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...
THIS IS THE FIRST IN A LONG LINE OF THANKSGIVINGS TO COME.我只愿和你共度感恩节.Thanksgivings are hard to feel thankful for, with dinner served on a cold, metal cafeteria tray.感恩节吃的是自助食堂里用金属餐具盛装的晚餐, 很难让人产生感恩之心....