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【单选题】
亚硝酸钠法滴定开始时将滴定管尖端插人液面下约2/3处的原因是____。A.
重氮化反应速度减慢
B.
重氮化反应速度加快
C.
避免HNO2挥发和分解
D.
加入KBr
E.
保持30℃以下
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