题目内容

总线型网络拓扑结构就是一条传输线。

A. 正确
B. 错误

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下列著作中体现“物竞天择,适者生存”观点的是()

A. 《狂人日记》
B. 《海国图志》
C. 《天演论》
D. 《四洲志》

教师在体育活动中对不同能力水平的幼儿提出不同的要求。

A. 正确
B. 错误

储蓄出纳错款属于责任事故,执行长款归公、短款自赔的原则。

A. 正确
B. 错误

You are responsible for managing the database schema for an order entry application in a SQL Server 2005 database. After a design review, a member of the development staff asks you to add a new column named CommissionRate to the Product table. Because the actual commission rates for all products are not known at this time, each product has a default commission rate of 12 percent. The rate can be modified as necessary. You add the new column. You need to configure the table to assign the default value as efficiently as possible. What should you do?()

A. Create an INSERT trigger to assign the default value to each item in the table.
B. Create a CHECK constraint to validate the data and to assign the default value to each item in the table.
Create an UPDATE trigger to update the default value for each new item in the table.
D. Create a DEFAULT constraint to assign the default value specifying the WITH VALUES argument.

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