Which two tasks can you perform using only the TO_CHAR function? （） convert 10 to 'TEN'。 convert '10' to 10。 convert 10 to '10'。 convert 'TEN' to 10。 convert a date to a character expression。 convert a character expression to a date。
使小企业创业成功率提高的创业方式是（） 特许经营。 家族企业。 购买现存企业。 创建新企业。
A constraint in a table is defined with the INITIALLY IMMEDIATE clause. You executed the ALTER TABLEcommand with the ENABLE VALIDATE option to enable the constraint that was disabled. What are the twoeffects of this command（） It fails if any existing row violates the constraint.。 It does not validate the existing data in the table.。 It enables the constraint to be enforced at the end of each transaction.。 It prevents insert， update， and delete operations on the table while the constraint is in the process of beingenabled。
A customer plans to implement SVC as part of a solution and has concerns regarding the resilience of the SVC architecture. The correct response to this concern is that SVC（）. is stateless with global referencing of metadata。 is based on cluster architecture with externally provided quorum disks。 is based on cluster architecture, with quorum held internally on the first cluster node。 is based on grid architecture, with each node holding a full mirror configuration for all other node。
Ⅱ相反应主要包括哪些结合作用？
在对施工成本目标进行动态控制跟踪和控制时，成本的控制周期应视项目的规模和特点而定，一般工程项目成本控制的周期为（）
