Which three statements are true regarding the data types in Oracle Database 10g/11g?（） Only one LONG column can be used per table 。 A TIMESTAMP data type column stores only time values with fractional seconds 。 The BLOB data type column is used to store binary data in an operating system file 。 The minimum column width that can be specified for a VARCHAR2 data type column is one 。 The value for a CHAR data type column is blank-padded to the maximum defined column width。
与参考点有关的物理量是（） 电流。 电压。 电位。 电动势。
推动电子结算发展的力量来自（） 技术成本的降低、经营成本的降低、在线商务的增加。 技术成本的降低、库存的减少、在线商务的增加。 库存的减少、处理成本的降低、在线商务的增加。 经营成本的降低、处理成本的降低、库存的减少。
土地承包经营权的转包
You executed the following command in the Recovery Manager (RMAN): RMAN> REPORT NEED BACKUP days 3; What is the output of this command?（） A list of files that require a backup within 3 days。 A list of files requiring more than 3 days of archivelogs to apply。 A list of files that RMAN recommends be backed up only once in every three days, based on low volatility。 A list of files for which a backup as already been performed in the last three days and which is required to be backed up again based on the high number of transactions performed on them。
在铁路运输运费计算中，对于不同运价等级的货物，以一批按整车托运的，或者在一个包装内以总重量按零担托运的，其运价等级和运费率采用的标准是（）
