宽带城域网在组建方案中，要按照电信级运营的要求，考虑设备冗余、——、路由冗余，以及系统故障的快速诊断与自动恢复。
A. 系统计费
B. 系统扩展
C. 系统接人
D. 线路冗余
The farmer put up iron fences around the flower______garden neighbor's sheep should break
A. on condition that
B. now that
C. lest
D. but
普通百姓其次考虑的最多的因素比最少的因素高多少？
A. 8.3
B. 34.8
C. 13.8
D. 26.6
Then in June 1967 the country______diplomatic relations with Israel after the outbreak of
A. broke away
B. broke off
C. cut out
D. cut down
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