实行双重课税的组织形式为（） ["单一业主制","合伙企业","有限责任公司","股份有限公司","合资企业"]
提取坏帐准备所依据的会计核算的一般原则是（）。 ["谨慎性原则","相关性原则","配比原则","一致性原则"]
You are a database developer. You plan to design a database solution byusing SQL Server 2008. You are creating adataba seto support the office manager. Your database model has the following structure. The database design has the following business requirements: An employee can be assigned more than one task. Upon completion, thetask is deleted. When a task is deleted, the associated assignment is deleted. When an employee is nolonger available tocomple tea task, theemployee link to the assignment is replaced with a NULL value. You need to implement the business requirements to maintain data integrity. What should you do?（） ["Create DDL INSERT triggers on the Employee. Task and Assignment entities.","Create CHECK constraints on the Task ID and Employee ID attributes in the Assignment entity.","Create Foreign Keys constraints on the Task ID and EmployeeID attributes in the Assignment entity. Reference the Task and Employee entities respectively. Specify the appropriate On Delete action.","Create Foreign Keys constraints on the Task ID and Employee ID attributes in theTask and Employeeentities respectively. Reference the Assignment entity, and specify the appropriate On Delete action."]
试述城市文化系统的运行过程。
以股权参与和契约结合的方式，可以将企业战略联盟划分这样几种类型：（） ["合资企业","合伙经营","股权参与","功能性协议","合作经营"]
遗传毒性致癌物
