根据开头字母, 补全单词。 1. Do you know who the computer was i _____ by? 2. The seat belt on a plane are a _____. 3. It was a big m _____ to leave my umbrella at home. 4. A c _____ is a hundred years. 5. Boys, stop t _____ stones to the poor dog.
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【简答题】PCM30/32 脉冲编码调制系统的线路码率是( )。 A 、 2.048 Mb/s B 、 kb/s C 、 128 kb/s D 、 8 Mb/s