【单选题】假设通信电文使用的字符集为{a,b,e,d,e,f},各字符在电文中出现的频率分别为{34,5,12,23,8,18},利用构造Huffman树对每个字符进行编码,则其中编码长度最长的字符是
【单选题】I have a big dream — I want to go into space, _______ will take some time to realize, I guess.
【单选题】_____ I have a dream to become a singer,I don’t have a gift for music.
【简答题】I have a dream that we will one day live in a _________where we’ll have a lot of trees and fresh air. A.state B.country C.nation D.space
【单选题】I have a big dream — I want to go into space, _______ will take some time to realize, I guess.