问题
单项选择题
于乙醚与水两相介质中，用盐酸滴定液(0．02mol/L)滴定法检查对氨基水杨酸钠中的间氨基酚特殊质（）
A．酚酞指示剂
B．甲基橙指示液
C．永停终点法
D．自身指示终点法
E．淀粉指示液
答案
参考答案：C
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于乙醚与水两相介质中，用盐酸滴定液(0．02mol/L)滴定法检查对氨基水杨酸钠中的间氨基酚特殊质（）
A．酚酞指示剂
B．甲基橙指示液
C．永停终点法
D．自身指示终点法
E．淀粉指示液
参考答案：C
根据句意，从方框中选择恰当的单词填空。部分单词在在填入时须进行词形转换，每个单词只能选用一次。每空只能填一词。
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