吊顶内的排烟管道应采用不燃材料隔热，并应与可燃物保持不小于（）的距离。
A. 100mm
B. 120mm
C. 150mm
D. 200mm
涉及面广、偶然性大、不定因素多、无先例可循、无既定程序可依的决策是（）
A. 战略决策
B. 战术决策
C. 常规决策
D. 非常规决策
E. 团体决策
You need to ensure that there is adequate bandwidth available to meet the service-level agreement requirements. Which action or actions should you perform？ （）
A. Upgrade all WAN lines in six months.
B. Upgrade all WAN lines prior to implementing NewApp.
C. Analyze the cause of a peak in network usage in February.
D. Analyze network usage characteristics for NewApp.Based on these results， create an upgrade plan for the WAN lines.
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