噬菌斑
You own a table called EMPLOYEES with this table structure: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE What happens when you execute this DELETE statement? DELETE employees; （） [" You get an error because of a primary key violation."," The data and structure of the EMPLOYEES table are deleted."," The data in the EMPLOYEES table is deleted but not the structure."," You get an error because the statement is not syntactically correct."]
新经济政策与战时共产主义政策相比，主要“新”在（）。 ["国家控制了一切经济命脉","建立了社会主义经济基础","在一定限度内恢复了资本主义，发展了商品生产","无产阶级掌握了政权"]
菌落
工作分析主要有哪些方法它们各有什么优点和缺点
沃斯认为城市人口有三个特点有哪些。
