问题
单项选择题
ATM适配层的功能是( )。
A.比特定时
B.信元校验
C.分割和合并用户数据
D.信元头的组装和拆分
答案
参考答案:C
解析: TM适配层(AAL)负责处理高层来信息,发送方把高层的数据分割成48字节长的ATM负载,接收方把ATM信元的有效负载重新组装成用户数据报。
ATM适配层的功能是( )。
A.比特定时
B.信元校验
C.分割和合并用户数据
D.信元头的组装和拆分
参考答案:C
解析: TM适配层(AAL)负责处理高层来信息,发送方把高层的数据分割成48字节长的ATM负载,接收方把ATM信元的有效负载重新组装成用户数据报。
完型填空。 | ||||
When you look into the sky at night, you can see a large number of stars. Besides, you can see the 1 too. It's bright 2 beautiful. People write many songs and poems (诗歌) 3 it. In the 1960s, some 4 wanted to be the first one to send a man to the moon. America and Russia were in this "space race". They 5 a lot of money 6 it. The 7 man in space was Yuri Gagarin, a Russian. He went into the space 8 1961. A few years later, an American spaceship flew to the moon. Neil Armstrong walked out. He was the first man 9 on the moon. China is interested in the space too. In 2003, Yang Liwei, China's hero, flew 10 the earth in space. | ||||
|