假设用户不小心更改了一些设置值，可以选择（）来恢复，方便于发生故障时进行调试（）
A. Load Setup Defaults
B. Load Turbo Defaults
C. PNP/PCI Configuration
D. AMD Advanced Chipest Features
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oracle关闭数据字典访问权限需要执行的命令为:（）
A. alter system set O7_DICTIONARY_ACCESSIBILITY=0 scope=spfile;
B. alter system set O7_DICTIONARY_ACCESSIBILITY=FALSE scope=spfile;
C. alter system set O7_DICTIONARY_ACCESSIBILITY=null scope=spfile;
D. alter system set O7_DICTIONARY_ACCESSIBILITY=none scope=spfile;
sqlserver查询空口令用户需要执行的sql语句为（）
A. Select name.Password from syslogins where password is null order by name
B. Select name.Password from syslogins where password is none order by name,Password
C. Select name.Password from syslogins where password=null order by name,Password
D. Select name.Password from syslogins where password=none order by name
ciso交换机配置console口密码的命令是:（）
A. line console 0 password cisco
B. line console password cisco
C. line console cisco
D. line console 0 passwd cisco
在mysql中备份表正确的语句为（）
A. select * into table2 from table1
B. create table table2 as （select * from database..table1）
CREATE TABLE tb_cab_bak LIKE tb_cab;INSERT INTO tb_cab_bak SELECT * FROM tb_cab；
D. mysqldump -h主机名 -P端口 -u用户名 -p密码 –database 数据库名 ＞ 文件名.sql
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