题目内容

Maps are ______.

A. primary sources
B. secondary sources
C. tertiary sources

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textbooks are _______.

A. primary sources
B. secondary sources
C. tertiary sources

Papers in a journal are ______.

A. primary sources
B. secondary sources
C. tertiary sources

Indexes are _______.

A. primary sources
B. secondary sources
C. tertiary sources

在滴定分析中，指示剂颜色突变而停止滴定的那一点称为_。在化学计量点附近，由于加入一点酸所引起的溶液pH的急剧改变称为_。

A. 化学计量点
B. 滴定终点
C. 滴定突跃
D. pH突跃