ListBox、ComboBox和RadioGroup 三个组件都有一个Items属性，请说出该属性对三个组件的用途各是什么？
施工机械的税费是指施工机械按照国家规定应缴纳的车船使用税、保险费及（）等。 ["过路过桥费","罚款","年通行费","年检费"]
You work as a database administrator at Certkiller .com. You are working in an online transaction processing （OLTP） environment. You realize that the salary for an employee， John， has been accidentally modified in the EMPLOYEEStable. Two days ago， the data was in the correct state. Flashback logs generated during last two days are available in the flash recovery area. Which option would you choose to bring the data to the correct state while ensuring that no other data in the same table is affected？（） [" perform point-in-time recovery"," perform a Flashback Table operation to restore the table to the state it was in two days ago"," perform a Flashback Database operation to restore the database to the state it was in two days ago"," perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery"]
When is an IPSec SA built on the Teleworker Router?（） ["when the router is booted up","when the router administratively does a no shutdown" on the IPSec SA ","when traffic matches a line of the access-list tied into the crypto-map in the router configuration, and that particular IPSec SA is not already up ","when the ISAKMP SA completes negotiation of all IPSec SAs (one per access-list line in the crypto ACL), it will be brought up immediately"]
表示热轧光圆钢筋的符号为（）。 ["HPB300","HRB335","HRB400","RRB400"]
为什么说五六十年代农村题材小说创作具有得天独厚的优越条件？
