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【简答题】
常用编码方式有归零码、[填空]、曼彻斯特编码、差分曼彻斯特编码
【多选题】
客户代码一般使用群码方式进行编码,通常包含客户( )。
【简答题】
常用编码方式有归零码、不归零码、[填空]、差分曼彻斯特编码
【单选题】
EAN-13码的编码必须遵循()原则。
【判断题】
设置科目编码时,各级科目编码必须惟一。
【判断题】
设置科目编码时,各级科目编码必须惟一。( )
【多选题】
在EAN-13条码中,中国物品编码的前缀码是( )
【单选题】
18. ______ the Atlantic Ocean crosses the equator, the trade winds cause a flow of water to the west.
【单选题】
13. Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again SARS, so we only had time for a few words.
【单选题】
21. — When will you leave for Paris for a visit? — next month.
【单选题】
27. For quite _____ students,their teachers advice is more important than _____ of their parents.
【单选题】
23. Never _______ forget the days when _______ together with you.
【单选题】
28. "_____ your meeting is!" he offered them his sincere congratulations.
【单选题】
24. Why didnt you tell me there was no meeting today? I _____ all the way here _____the heavy snow.
①
neednthavedriven;though
③
mustnthavedriven;through
④
shouldnthavedriven;cross
【单选题】
25.It was the training _______ he had at school _______ made him good jumper.
【单选题】
26. It was _____ great shock to the world that two airplanes crashed into _____ World Trade Centre in New York on Sept.11.
【单选题】
29. We must remember that _____fashion is not the most important thing in _______ life.