题目内容

在SIP UA注册过程中，收到了状态码为401的响应应消息，说明（）。

A. UA已经正常注册到注册服务器上
B. 表示UA发送的请求消息中包台了服务器不认识的字段，但已被服务器忽略，UA依然注册成功
C. 表示服务器需要UA发送认证信息，UA收到该响应后，会特自己的鉴权信息通过第二个注册请求发送给注册服务器
D. 表示UA发送的请求消息中包含了服务器不认识的字段，注册失败

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You are a professional level SQL Server 2005 database administrator in an international corporation named Wiikigo. You are experienced in implementing high-availability solutions， monitoring the database server， and design deployment. In the company， you major job is the deployment， maintenance and support of Microsoft SQL Server 2005.You work as a database administrator for your company. A SQL Server 2005 database is utilized in your company. And a table named Inventory is contained by the database. A column named Price is included by the table. According to the company policy， you cannot reduce more than 10 percent the value in the Price column in any single database operation. Through many kinds of method， the company makes updates to the Price column. For instance， the utilization of ad hoc queries is one of the methods. Since you are the database administrator， you should confirm that this company policy takes its effect. Which action should be performed？（）

A stored procedure should be created， and changes are disallowed by the procedure to the Price column that violates company policy.
B. On the Price column， a check constraint should be created， and a specified minimum value is required by the check constraint.
C. A trigger should be created， and changes are rolled back by the trigger to the Price column that violates company policy.
D. On the Price column， a foreign key constraint is created to a table that valid prices are included.

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（项目性能监控中的）图解控制方法

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反应器转移程序执行完毕后开始吹氮。

A. 正确
B. 错误

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集中监测系统对直流转辙机的监测点为（）。

A. 继电器
B. 动作回线
C. 表示回线
D. 分线盘

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