题目内容

Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. What is the conversation mainly about

A. How to care for precious metals.
B. A standard unit for measuring weight.
C. The value of precious metals.
D. Using the metric system.

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设电文中出现的字母为A、B、C、D和E,每个字母在电文中出现的次数分别为9、27、3、5和11。按哈夫曼编码,则字母C的编码应是()

A. 110
B. 1110
C. 10
D. 111

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