题目内容

Part IV — (Para. 12)The anywhere-anytime access has already _____1 in education. With the widespread application of digital technology, we are going to produce _2______________________________________.

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A. 滴定开始;
B. 反应中间;
C. 反应结束;
D. 接近终点

A. 使Fe3+与PO4 3-生成Fe(PO4)2 3-,
B. 消除Fe3+黄色对指示剂的干扰,
C. 使Cr3+变成无色的配离子。
D. 降低了Fe3+ / Fe2+电对的电位,使滴定突跃增大,指示剂的变色准确。

A. 对
B. 错

A. 异装癖
B. 易性癖
C. 窥淫癖
D. 露阴癖

Part IV — (Para. 12)The anywhere-anytime access has already ___________1____________ in education. With the widespread application of digital technology, we are going to produce ___________2__________________________________________.