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能源统计台账的种类有哪五种？

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You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named DB1 in the instance. At present about 90 GB of data is stored in DB1. You made some rough calculations that every day about 1 GB of data is modified or inserted. You set the recovery model of DB1 to Simple. According to the company requirements, during business hours, data loss of more than 120 minutes worth of transactions is unacceptable. You have to choose a backup strategy which must comply with the following two requirements: Using as little disk space as possible Complying with the company requirements. So what action should you perform to achieve this goal?（）

A full database backup should be performed once daily. During business hour, a transaction log backup should be performed every two hours.
B. A full database backup should be performed once daily
C. A full database backup should be performed once daily. During business hours, a differential backup should be performed every two hours
D. Perform a full database backup should be performed once every week. A differential backup should be performed once daily. During business hours a transaction log backup should be performed every two hours.

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城市树种调查的内容有哪些？

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依据《华电国际工作票和操作票管理规定》，根据操作票审批权限，正式的操作命令由值长向值班负责人、值班负责人向下列哪些人员发布？（）

A. 监护人
B. 运行专工
C. 许可人
D. 操作人

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位级运算：0x69 & 0x55 的结果是（）

A. 0X40
B. 0X41
C. 0X42
D. 0X43

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