What is TRUE about the Social Security program according to the passage?
A. Both employers and employees pay into the pension program.
B. Workers pay most amount of the money into the program.
C. The local and the federal governments jointly established the program.
D. Self-employed people needn’t pay into the program for themselves.
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The largest retirement program in the United States is run by ________.
A. the insurance companies
B. the state governments
C. the federal government
D. the private companies
重启httpd服务的命令是？
A. systemctl start httpd
B. systemctl stop httpd
C. systemctl restart httpd
D. systemctl status httpd
设置httpd服务随系统开机启动使用的命令是？
A. systemctl start httpd
B. systemctl enable http
C. systemctl disable httpd
D. systemctl enable httpd
http服务默认端口是______，使用______访问。
A. 80 浏览器
B. 22 xshell
C. 445 浏览器
D. 21 浏览器
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