A.8%~12%HCl溶液 B.10%NaCl+2%NaOH溶液 C.8%~12%NaOH溶液 D.10%NaCl+2%HCl溶液
A.≥30% B.≥40% C.≥45% D.≥50%
A.≥15% B.≥20% C.≥25% D.≥30%