10BASE-T以太网使用曼彻斯特编码，其编码效率为 (81) %，在快速以太网中使 发布时间：2019-04-07 02:35 │ 来源：www.tikuol.com 题型：单项选择题 问题： 10BASE-T以太网使用曼彻斯特编码，其编码效率为 (81) %，在快速以太网中使用4B/5B编码，其编码效率为 (82) %。A．30B．50C．80D．90
题型：单项选择题 完形填空。 Jody was ten years old when he decided he needed a job. He thought it might be 1 to raise (养) worms. Hecould sell them to farmers and people who fished. So in 2 , he bought many worms. But that winter the cold weather killed all the worms because he had not 3 them in a warm place. The next spring Jody 4 again. He bought more worms, which he took good care of. When winter came, he took them inside 5 they would stay warm. Many people bought his worms. One day when Jody was twelve, he got a letter. It was frome state (州) of New York. The letter said, "Everyone who 6 things has to pay taxs (税)!" Jody made only one dollar selling worms. But he still 7 to pay part of that money to the state. He told many people in his town what had 8 . Soon some people from a television station 9 with Jody. Many people saw it and they began to write letters to the state. The letters nowsaid that the law was 10 . Finally the law was changed. Children like Jody can now sell things without payingmoney to the state. ( ) 1. A. boring ( ) 2. A. autumn ( ) 3. A. caught ( ) 4. A. tried ( ) 5. A. before ( ) 6. A. buys ( ) 7. A. hoped ( ) 8. A. followed ( ) 9. A. talk ( ) 10. A. common B. lucky B. spring B. found B. waited B. until B. sells B. wanted B. appeared B. visit B. unfair C. fun C. winter C. hidden C. failed C. though C. keeps C. had C. happened C. quarrel C. different D. impossible D. summer D. put D. practised D. so D. presents D. remembered D. continued D. work D. useless 查看答案