题目内容

某金属指示剂Hln在溶液中存在下列平衡：
它与金属离子形成红色的配合物。使用该指示剂的pH范围及滴定终点时溶液的颜色分别是

A. pH＜12.41，红色 B．pH＞12.41，红色 C．pH＞12.41，黄色 D. pH＜12.41，黄色

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某金属指示剂Hln在溶液中存在下列平衡：它与金属离子形成红色的配合物。使用该指示剂的pH范围及滴定终点时溶液的颜色分别是

A. pH＜12.41，红色 B．pH＞12.41，红色 C．pH＞12.41，黄色 D. pH＜12.41，黄色

What does the author state is the most important reason men die five years earlier on average than women？

10 The company recommended that a new petrol station be built here.A demanded B suggested C insisted D ordered

What was the main concern of industrialists before the marketing concept was widely

投资者常常使用折价率反映封闭式基金份额净值与封闭式基金二级市场价格之间的关系。折(溢)价率的计算公式为（）。

某金属指示剂Hln在溶液中存在下列平衡：
它与金属离子形成红色的配合物。使用该指示剂的pH范围及滴定终点时溶液的颜色分别是

10 The company recommended that a new petrol station be built here.
A demanded B suggested C insisted D ordered