带外FEC功能的单板再不同配置情况下可以实现哪四种功能？
参考答案：
带外FEC编码、带外FEC解码、带外FEC解码后再编码无带外编码解码四种功能。
按要求完成下列句子。
1. She has some ping-pong balls. (改为否定句)
She _____ any ping-pong balls.
2. I have a baseball. (改为一般疑问句)
_____ _____ have a baseball?
3. She has a good friend. (改为复数)
They _____ three good _____.
4. Tom has three soccers. (对划线部分提问)
_____ soccers does Tom have?
5. Does Mary have an MP4?(作否定回答)
_____, She _____.
TrueType字体既可以作打印字体，又可以用作屏幕显示，PS字体主要用于设备输出，不能用于屏幕显示。
