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【单选题】
在酸性介质中，用草酸钠标定高锰酸钾溶液，滴加高锰酸钾溶液时应注意A.
始终快速进行
B.
开始时缓慢滴定，以后逐渐加快
C.
始终缓慢进行
D.
开始快速，然后缓慢，最后又逐渐加快
E.
开始，以后逐渐缓慢
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