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【单选题】
关于滴定管的使用，错误的是（）
A.
装滴定液之前，要用该滴定液荡洗滴定管 2-3次，以除去残留水分，保证滴定液浓度不变
B.
装滴定液之前荡洗滴定管，每次倒入滴定 液5-10ml,从试剂瓶直接倒入滴定管，不能借助其他容器
C.
酸式滴定管用左手控制活塞，大拇指在前， 食指和中指在后，轻轻向内扣住活塞，手控 握以防将活塞顶出
D.
读数时滴定管取下，用右手拇提和食指捏住滴定管上部无刻度处，使滴定管保持垂直状态，读取弯月面下最低处与刻度的相 切之点
E.
滴定完毕后将滴定管内的溶液倒回原试剂
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