题目内容
设7个字母在通信中出现的频率如下：a：35%b：20%c：15%d：10%e：10%f：5%g：5%用Huffman算法求得的最佳前缀码传输100 个按上述比例出现的字母组成的字符串需要____bit。（本次习题总分30分）
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Listen to the passage and fill in the blanks with the words you hear. Dear Sirs,We have your name and address from your chamber of commerce stationed in Beijing and wish to introduce ourselves in the hope of entering into direct 1) with your company.The products we are dealing in for over 10 years are electrical appliances. We are in a good position to serve our customers with the most reliable quality and 2) .To give you a general idea of the scope of our business activities, we 3) a complete set of booklets showing the full range of our products.Our bankers are the bank of Tokyo, Japan. They can provide you with the information of our 4).We are looking forward to your 5).Yours faithfully,Zhang WeiSales Manager
Listen to the five short conversations and tell whether the statements are true or false. Write T for true and F for false. 1.The man is trying to create an opportunity to promote his new products.
2.The woman wants to look through the catalogue first.
3.The man failed to get a complete set of the catalogues.
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