变压器内绕组或上层油温的温度与变压器外围空气的温度(环境温度)之差,称为绕组或上层油的温差。
查看答案
You install a copy of Mysql 5.6.13 on a brand new Linux server by using RPM packages. The server starts successfully as verified by the following commands: $ pidof mysqld 3132 $tail – n2 /var/lib.mysql/hostname.err 2013-08-18 08:18:38 3132 [Note] /usr/sbin/mysqld:ready for connections. Version: '5.6.13-enterprise-commercial-advaced' socket:'/tmp/mysql.sock' port; 3306 Mysql Enterprise Server – Advanced Edition (Commercial) You attempt to log in as the root user with the following command: $mysql – u root ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) Which statement is true about this scenario?()
A. The RPM installation script sets a default password of password for new installations
B. The local root user must log in with a blank password initially: mysql –u root –p
C. New security measures mean that the mysql_secure_installation script must be run first on all new installations
D. The mysql_install_bd post-installation script used – random-password
CDMA,FDMA和TDMA都是干扰受限系统。
A. 正确
B. 错误
()中的三氧化硫的含量不得超过4%。
A. 普通硅酸盐水泥
B. 矿渣硅酸盐水泥
C. 火山灰质硅酸盐水泥
D. 粉煤灰硅酸盐水泥