下列关于Huffman树和Huffman编码的说法正确的有: Which sentences of the followings are right about Huffman tree and Huffman code:
A、Huffman树一定是满二叉树。A Huffman tree must be a full binary tree.
B、Huffman编码是一种前缀编码。Huffman code is a kind of prefix code.
C、Huffman树一定是完全二叉树。A Huffman tree must be a complete binary tree.
D、Huffman编码中所有编码都是等长的。All codes in a Huffman code have the same length.
E、对于同样的一组权值两两不同的内容可以得到不同的Huffman编码方案。Different content with the same group of weights can get different Huffman codes.
F、使用频率越高的字母,Huffman编码越长。The higher a letter's frequency is, the longer its Huffman code is.