1.下列元素在化合物中,可变化合价最多的是 ()。 A.铝B.氯C.镁D.氧 2.为维持人体内电解质平衡,人在大量出汗后 应及时补充的离子是()。 A.M沙‘B,caz+ c.Na·D.Fe3+ 3.下列块状单质在常温时能全部溶于足量浓 HN03的是()。 A .C B.Cu C.Al D.Fe 4.二氧化碳通人下列各溶液中,不可 1. The following elements in the compound, the most variable valence is (). A. Aluminium B. Chlorine C. Magnesium D. Oxygen 2. In order to maintain electrolyte balance in the human body, the ion that should be supplemented promptly after heavy sweating is (). A. M sand ‘B,caz+ c.Na·D.Fe3+ 3. The following bulky elements were all soluble in a sufficient amount of concentrated HN03 at room temperature (). A .C B.Cu C.Al D.Fe 4. Carbon dioxide through the following solutions, not