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调度计划的执行与变更有哪些要求？

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塔式起重机启动应符合下列哪些要求（）

A. 金属结构和工作机构的外观情况应正常
B. 安全保护装置和指示仪表应齐全完好
C. 齿轮箱、液压油箱的油位应符合规定
D. 各部位连接螺栓可以稍微松动
E. 钢丝绳磨损应在规定范围内，滑轮穿绕应正确

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权力救济功能

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You are the administrator for Company's network. Your account is configured to use roaming profiles and your username is Johan1. The profile is stored on a Windows 2000 Server computer named CompanyA. You log on to your Windows 2000 Professional computer and install a shared color laser printer. The color laser printer is shared from a computer named CompanyB. The next day when you return and log on to your computer you discover that when you attempt to print a document to the shared color laser printer, the printer is not included in the list of available printers. You want the printer connection to be available to you from any computer on the network. What should you do? （）

A. On CompanyA configure a local user account for Johan1.
B. On CompanyA change the file ntuser.man to ntuser.dat for Johan1
C. Install an updated printer driver for the print device on the user’s computer.
D. Grant Johan1 the Manage Printers permission for the shared color laser printer.

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两性电解质分子在电中性时溶解度最低，利用不同的两性电解质分子只有不同的等电点而进行分离的方法称为等电点沉淀法。

A. 正确
B. 错误

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