【单选题】【消耗次数：1】
酸碱滴定中选择指示剂的原则是
①
A指示剂的变色范围与化学计量点完全相符
②
B指示剂应在pH=7.00时变色
③
C指示剂变色范围应全部落在pH突跃范围之内
④
D指示剂的变色范围应全部或部分落在pH突跃范围之内
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