Nefedipine was synthesized with m - Nitrobenzaldehyde, ethyl acetoacetate ammonium acetate.以间硝基苯甲醛, 乙酰乙酸乙酯,氨化试剂为原料.Fructone was synthesized from ethyl acetoacetate and glycol using activated carbon supported phosphotungs...
His skin was covered with unsightly blotches.他的皮肤上长满了难看的疹块.His face was covered in red blotches, seemingly a nasty case of acne.他满脸红斑，像是起了很严重的粉刺。This may show as luminescent blotches or spots on the body.这一点是指其身体上的发光斑或发光...
氧化还原反应在铁和锰的增溶和沉淀中具有重要作用.Oxidation - reduction reactions are important in the solubilization and precipitation of iron and manganese.有机物 、 褐铁矿和氧化锰的含量影响着成矿元素含量的变异.The contents of organic material, limonite and manganese hy...