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计算机网竿的主要功能为硬件资源共享、【】共享、用户之间的信息交换。

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Part A
You have received the invitation below, but you will not be able to attend the party. Write a letter to Mr. Smith, explaining the reason why you cannot go and how you plan to make up for it.
Mr. and Mrs. Smith request the presence of Mr. Wang Lin on the occasion of their wedding ceremony on October 24th, Saturday, at 10 a. m. the Apple Hotel, Haidian District, Beijing.

Tyrrell, George

输入/输出端口有两种编址方法，即I/O端口与存储器单元统一编址和I/O端口单独编址。前一种编址的主要优点是【】，后一种编址的主要优点是专用I/O指令字节数少，指令执行快和不占用存储空间。

在Excel 97工作表的某单元格内输入数字字符串“2004”，能正确输入的形式为