六氟化硫封闭式组合电器元件装配前，其密度继电器和压力表应经（）
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列尾控制盒检查风压或确认完毕时的尾部风压×××千帕时，显示（）。
A. F××（不闪烁）
B. F×××（闪烁）
C. P×××（闪烁）
D. F000（闪烁）
计算手弧焊机负载持续率时，规定工作周期为（）。
A. 4小时
B. 0.5小时
C. 5分钟
D. 10分钟
Which three statements are true about EIGRP route summarization?（）
A. When manual summarization is configured, the router immediately creates a route that points to null0 interface
B. Manual route summarization is configured in router configuration mode when the router is configured for EIGRP routing
C. Manual route summarization is configured on the interface
D. The ip summary - address eigrp command generates a default route with an administrative distance of 5
E. When manual summarization is configured, the summary route will use the metric of the largest specific metric of the summary routes
F. The ip summary - address eigrp command generates a default route with an administrative distance of 90
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