如何针对不同类型的火灾选择灭火器？
Which of the following commands would you enter if you wanted to display spanning treestatistical information？（） ["show spantree backbonefast","show spantree statistics","show spantree uplinkfast","show spantree blockedports","show spantree portstate","show spantree portvlancost"]
二级及以上等级公路1m3压实体积，如属于普通土时，需要天然密实体积为（）m3。 ["1.05","1.09","1.16","1.25"]
经常性检查应根据工作繁重、环境恶劣的程度确定检查周期，但不得少于（）一次。 ["1月","2月","1.5月","2.5月"]
You work as the application developer at Certkiller .com. Certkiller .com uses Visual Studio.NET 2005 as its application development platform.You are developing a .NET Framework 2.0 application used to store a type-safe list of names and e-mail addresses. The list will be populated all at ones from the sorted data which means you well not always need to perform insertion or deletion operations on the data. You are required to choose a data structure that optimizes memory use and has good performance.What should you do？（） [" The System.Collections.Generic.SortedList class should be used"," The System.Collections.HashTable class should be used"," The System.Collections.Generic.SortedDictionary class should be used"," The System.Collections.SortedList class should be used"]
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