题干

下列有关仪器使用方法或实脸操作说法错误的是(   )

A:酸碱中和滴定时,滴定管使用前需用待装液润洗而锥形瓶不用

B:做焰色反应时,可用光洁无锈的铁丝代替铂丝进行实验

C:测定新制氯水的pH,用玻璃捧蘸取液体滴在pH试纸上,再对照标准比色卡读数

D:萃取时,振荡过程中放气是通过打开分液漏斗旋转活塞进行的

上一题 下一题 0.0难度 选择题 更新时间:2017-04-17 12:10:52

答案(点此获取答案解析)

C

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