A.8~11 B.4~6 C.5~7 D.1~13
A.50B.60C.100
A.滴定管未經(jīng)校準(zhǔn) B.滴定時(shí)有溶液濺出 C.指示劑選擇不當(dāng) D.試劑中含有干擾離子