第5题: [单项选择]Append blank命令的作用是______。 A. 编辑记录 B. 在第1条记录前增加新记录 C. 在表尾增加一条空白记录 D. 在当前记录前增加一条空白记录 参考答案:C 答案解析:[知识点] 表记录的浏览、增加、删除与修改 [评析] Append blank命令的作用是在表尾增加一条空白记录。 Edit的作用是编辑当前记录。 Append命令的作用是在
第16题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard.[A] Her professor did not like her story. [C] She did not like the topic she had chosen for her paper. [B] She had trouble finishing her assignment. [D] She was taking too many courses. 参考答案:B 答案解析:[听力原文]23-25 M: I am so relieved, I just finished the story I was working on for our creative writ
第36题: [单项选择]MPLS(多协议标记交换)根据标记对分组进行交换,MPLS包头的位置应插入在______。 A. 以太帧头的前面 B. 以太帧头与IP头之间 C. IP头与TCP头之间 D. 应用数据与TCP头之间 参考答案:B 答案解析:MPLS(多协议标记交换)根据标记对分组进行交换,MPLS包头的位置应插入在二层和三层之间(以太帧头与IP头之间),俗称2.5层。