安装在室内GIS汇控柜、预置舱的保护装置，正常工作环境温度范围为（）。
A. -20～40℃
B. -10～55℃
C. -10～40℃
D. -25～70℃
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Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine （）
A. slightly less than the line frequency
B. the same as the line frequency
C. slightly greater than the line frequency
D. All of the above
系统还原功能在（）功能菜单下。
A. 管理工具
B. 系统工具
C. 附件
D. 辅助工具
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