某火力发电厂,在海拔1000m以下,发电机变压器组单元接线如图所示。设i1、i2分别

题型:单项选择题 案例分析题

问题:

某火力发电厂,在海拔1000m以下,发电机变压器组单元接线如图所示。设i1、i2分别为d1、d2点短路时流过DL的短路电流,已知远景最大运行方式下,i1的交流分量起始有效值为36kA不衰减,直流分量衰减时间常数为45ms;i2的交流分量起始有效值为3.86kA,衰减时间常数为720ms,直流分量衰减时间常数为260ms。请解答下列各题(计算题按最接近数值选项)。

试计算接地开关GD应满足的最小动稳定电流最接近下列哪项数值()?

A.120kA

B.107kA

C.104kA

D.94kA

考点:电气工程师(发输变电)设备选择设备选择题库
题型:单项选择题 案例分析题

Application development increasingly means Windows development, and the popularity of visual development tools has (95) in tandem with Windows itself. These tools create beautiful windowing (96) , and their fast development cycles and easy learning curves make them a good (97) for many types of PC development projects. Today’s developers are leveraging these tools and the abundance of heap, powerful PCs to shift the balance of power to the desktop.

As the world moves inexorably toward Windows and other (98) user interfaces, developers can choose from an abundance of (99) oriented tools. Popular examples include Microsoft Corp.’s Visual Basic, Powersoft Corp.’s PowerBuilder, Gupta Technology Corp.’s SQL Windows, and so on.

99()

A.visually 

B.lively 

C.quickly 

D.specially

题型:单项选择题 案例分析题

.Opening the book, she found in it a white, plain envelope with her name ______ on it.

A.to print

B.printed

C.printing

D.print

题型:单项选择题 案例分析题

劳动合同变更

题型:单项选择题 案例分析题

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