Which of the following pump system saves more power?
A. single pump
B. double pump
C. single and double pump use same amount of power
D. none of the above
查看答案
确认httpd服务运行状态的命令为（）。
A. systemctl status httpd
B. systemctl restart httpd
C. systemctl start httpd
D. systemctl enable httpd
网站根目录为（）。
A. /var/www/html
B. /etc/httpd/conf
C. ~/.ssh
D. /ssh
如果没有安装httpd服务，可以使用（）命令安装该服务。
A. yum start httpd
B. yum install httpd
C. yum update httpd
D. yum erase httpd
使用（）命令，可以重启httpd服务。
A. yum install httpd
B. systemctl restart httpd
C. yum update httpd
D. yum erase httpd
微信支付 
支付宝支付