阿尔卡特7750SR-12系统是通过热交换叶轮（风扇）板来制冷的，当出现下列哪种情况下叶轮加快或者高速运行（）
A. SF/CPM初始化过程中
B. 设备温度超过122°F（50°C）时
C. SF/CPM初始化结束后
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特种设备使用单位应当按照安全技术规范的定期检验要求，在安全检验合格有效期届满前（）向特种设备检验检测机构提出定期检验要求。
A. 半个月
B. 1个月
C. 2个月
D. 3个月
《诗经》中保存民歌最多的是（）
A. 《颂》
B. 《大雅》
C. 《小雅》
D. 《风》
A router is running BGP and receives more than one route for a particular prefix. Assume all the routes for this prefix have the same attributes. Which three path features would be reasons be for the rou ter to ignore some of the routes and not consider them as candidates for the best path?（）
A. paths from an internal BGP (iBGP) neighbor if the local autonomous system (AS) appears in the AS_PATH
B. paths for which the NEXT_HOP is inaccess ible
C. paths from an external BGP (eBGP) neighbor if the local autonomous system (AS) appears in the AS_PATH
D. paths for which the NEXT_HOP is accessible
E. paths that are marked as synchronized in the show ip bgp output
F. paths that are marked as not synchronized in the show ip bgp output
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