题目内容

取2.00mL含2mol·L-1NH3的Cu2+溶液放入1.00cm的吸收池中。测得在某一确定波长的吸光度为0.600。然后取0.0100 mol·L-1 CuSO4溶液1.00mL添加到第一个吸收池中。再测得的吸光度为0.800。试指出第一个溶液中Cu2+的浓度为多少？

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解释：复合光和单色光，红移和紫移，增色效应和减色效应

举例说明生色团和助色团。

为什么原子光谱呈线状光谱，而分子光谱呈带状光谱？

Directions: Now, you will hear three news reports. At the end of each news report, youwill hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you are supposed to choose the best answer from the four choices marked A), B),C) and D).Questions 1 and 2 will be based on News ltem 1.[音频]

A. From a used car.
B. From Halfords.
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D. From DIY store.