每个子订单不能同时申请“退货退款/仅退款”与“只换不修服务”。
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用交流220V供电的洗墙灯属于哪类灯具，防触电保护等级内容是？
某厂总装机容量1200MW。2008年全年预计利用小时5800小时。该厂预计年发电量是（）万千瓦时。
A. 696000
B. 69600
C. 6960
D. 696
Which three statements about the Cisco MPLS TE Fast Reroute （FRR） process are true？（）
A. TE tunnels that are configured with the FRR option cannot be used as backup tunnels.
B. TE tunnels that are configured with the FRR option can be used as backup tunnels.
C. The backup tunnel that is used to protect a physical interface must have a valid IP address configured.
D. Interfaces must use MPLS global label allocation.
E. The source IP address of use backup tunnel and the merge point （MP） should not be reachable.
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