填空题
Which command （without options） would you use to display how much space is available on all mounted partitions？（）
/BIN/DF
单项选择题 WithXorg7.0，whatisthenameofthedefaultfontserver？（）
单项选择题 YouhavejustaddedaCD.ROMdrive（/dev/hdd）toyoursystemandhaveaddedittoyourfstab.Typicallyyoucanusewhichofthefollowingcommandstomountmediainthatdriveto/mnt/cdrom？（）
