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【单选题】
关系型数据库是采用( )为基础结构的数据库。A.
二维表
B.
关系模型
C.
结构模型
D.
概念模型
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【简答题】Part A Suppose you have a foreign friend, Frank Harrison, who invited you to his house for a dinner party yesterday. Write a letter of thanks to Mr. Frank Harrison, telling him about: 1) your thanks f...
【单选题】You have invited a business colleague to lunch. Who pays for the meal?
A.
You because you invited your colleague to lunch.
B.
Your business colleague because she accepted the invitation.
C.
Whichever one of you the waiter places the bill in front of pays.
D.
You both pay half.
【简答题】(17）关于1Gbps Gigabit Ethernet，说法不正确的是( ）。 A）用介质独立接口(MII）将MAC子层与物理层分隔 B） IEEE 802.3z是Gigabit Ethernet的标准 C）与传统的10Mbps以太网具有相同的组网方法 D）每个比特发送速率由10Mbps的100ns降低到Ins
【简答题】下列具有利尿作用的药物是（ ）
【简答题】可将㨰法分为 、 、 、 等术式。
【单选题】Do you know how many people ______ up to now?
A.
have invited
B.
have been invited
C.
had invited
D.
had been invited
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