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【单选题】
用容量瓶配制准确浓度的溶液时,下列操作导致溶液浓度偏高的是 ( )A.
洗涤烧杯和玻璃棒的溶液未转入容量瓶中
B.
容量瓶中原来残余有蒸馏水
C.
后摇晃后容量瓶液面低于刻度线，又加水至刻度线
D.
，眼睛俯视溶液将凹液面最低点与容量瓶刻度线相切
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