单选题Which command should an administrator use to put a system in maintenance mode without rebooting?（）Ainit 0Btelinit mCshutdown -FMDsh /etc/rc.maint
单选题
Which command should an administrator use to put a system in maintenance mode without rebooting?（）
A
init 0
B
telinit m
C
shutdown -FM
D
sh /etc/rc.maint
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解析：
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