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。
人的心理是（） A.脑的功能 。 B.客观现实的反映 。 C.主观映象 。 D.由心脏产生的。
表示热轧光圆钢筋的符号为（）。 HPB300。 HRB335。 HRB400。 RRB400。
接地网：由（）接地体在地下相互连通构成，为电气设备或金属结构提供基准电位和对地泄放电流的通道。 一组。 多组。 双组。 一组或多组。
婴儿游戏活动的最基本表现形式是（）
