【单选题】下列各组含氧酸的酸性强度的顺序不正确的一组是 ( ) A.HClO 4 > HClO 3 > HClO B. H 2 SO 4 > H 2 S 2 O 7 > HSO 3 F C.( HPO 3 ) n > H 4 P 2 O 7 > H 3 PO 4 D. H 2 SO 4 ≈ H 2 Se 2 O 7 > H 6 TeO 6
【单选题】Sellers who were originally willing to supply 800 units of a good at $4 per unit are now willing to supply 600 units at $4 per unit. That change would be described as: