welcome to emergency mode！after logging in ，type “journalctl -xb” to view system logs，“systemctl reboot” to reboot ，“systemctl default” to try again to boot into default mode。
give root password for maintenance
（？？ Control-D？？？）：

我是自动挂载的那个fstab文件有问题，该回原来的就行了

#
# /etc/fstab
# Created by anaconda on Fri Dec  3 01:19:35 2021
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=ccc55ae9-8f57-4651-b529-81d0affd0512 /boot                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0
/dev/sdb1    /SATA                              xfs     defaults,uquota 0 0                                      

然后挂载镜像

#
# /etc/fstab
# Created by anaconda on Fri Dec  3 01:19:35 2021
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=ccc55ae9-8f57-4651-b529-81d0affd0512 /boot                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0
/dev/sdb1    /SATA                              xfs     defaults,uquota 0 0 
/dev/cdrom /media/cdrom iso9660 defaults 0 0