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装炮作业现场有什么要求？

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“导管法浇筑水下混凝土、钢筋笼上浮”案例分析与答案解析题背景材料：某桥基础为6根￠2.0m的桩基，桩长20m，地质条件如下：原地面往下依次为黏土、砂砾石、泥岩，承包人拟选用冲爪钻成孔.采用导管法灌注水下混凝土，导管使用前进行了水密试验，为防止导管沉放过程中接触钢筋笼，导管居中后快速沉放，并将导管底部沉放到距桩底1m处，之后开始浇筑混凝土. 问题： 1、施工单位采用导管法浇筑水下混凝土时存在哪些问题？ 2、防治钢筋笼上浮的措施有哪些？

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制定劳动定额的方法通常有以下几种（）

A. 估算法
B. 商议法
C. 试工法
D. 修订定期和不定期的劳动定额
E. 技术测定法

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产生旋转磁场的基本条件是什么？在什么条件下旋转磁场是磁通恒定的圆形磁场？

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You are the network administrator for your company. The network consists of a single Active Directory domain. All network servers run Windows Server 2003, and all are members of the domain. All client computers run Windows XP Professional. Five Web servers host the content for the internal network. Each one runs IIS and has Remote Desktop connections enabled. Web developers are frequently required to update content on the Web servers. You need to ensure that the Web developers can use Remote Desktop Connection to transfer Web documents from their client computers to the five Web servers. What should you do? （）

A. Install the Terminal Server option on all five Web servers. Use Terminal Services Configuration Manager to modify the session directory setting.
B. Install the Terminal Server option on all five Web servers. Use Terminal Services Configuration Manager to create a new Microsoft RDP 5.2 connection.
C. On each Web developer's client computer, select the Disk Drives check box in the properties of Remote Desktop Connection.
D. On each Web developer's client computer, select the Allow users to connect remotely to this computer check box in the System Properties dialog box.

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