衡量计算机及网络安全的主要指标是（） 保密性、及需性、完整性。 保密性、完整性、不可否认性。 完整性、保密性、可用性。 完整性、保密性、辨识性。
Examine the data in the EMPLOYEES and DEPARTMENTS tables: Also examine the SQL statements that create the EMPLOYEES and DEPARTMENTS tables: On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID. DEPT_ID is foreign key to DEPARTMENT_ID column of the DEPARTMENTS table. On the DEPARTMENTS table, DEPARTMENT_ID is the primary key. Examine this DELETE statement: What happens when you execute the DELETE statement?（） Only the row with department ID 40 is deleted in the DEPARTMENTS table.。 The statement fails because there are child records in the EMPLOYEES table with department ID 40.。 The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 110 and 106 are deleted from the EMPLOYEES table.。 The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 106 and 110 and the employees working under employee 110 are deleted from the EMPLOYEES table.。 The row with department ID 40 is deleted in the DEPARTMENTS table. Also all the rows in the EMPLOYEES table are deleted.。 The statement fails because there are no columns specifies in the DELETE clause of the DELETE statement.。
采用环刀法测定压实度时，石灰土类基层每1000m2检查（）。 1点。 2点。 3点。 4点。
就论证端午节是中国历史悠久的传统节日而言，下列哪方面的证据应当最有说服力（）。 古籍的记载。 屈原的作品。 政府的声明。 学者的解释。
目前我国溶解气体共有（）种。 1。 2。 3。 4。
固定连接的双母线差动保护，当母线固定连接方式破坏后，母线保护应投在（）位置。
