Which command(s) will result in the smallest sized backup of the text files contained in the /staticFS filesystem?（） ["tar -cvf file_system.tar \/staticFS ; gzip file_system.tar","tar -xvf \/staticFS file_system.tar ; gzip file_system.tar","tar -cvf \/staticFS file_system.tar ; compress file_system.tar","tar -xvf file_system.tar \/staticFS ; compress file_system.tar"]
lisa is writing a formula to determine the number of elements in a list. she wants to ensure that a value is returned, even if the value her function is evaluating turns out to be a null string . which one of the following can she so to accomplish this ?（） ["use a defaule formula of 1 ","use @elements and add 1 to the total ","use the @count function instead of @elements ","use @texttotime to ensure that all strings arte converted to date-time values&e"]
气瓶充装标签必须逐瓶粘贴。未逐瓶粘贴的，责令改正，处（）罚款，情节严重的，暂停充装，直至吊销其充装许可证。 ["1万元以上3万元以下","5千以上1万以下","1万元以上","3万元以下"]
You executed the following command to drop a user: DROP USER scott CASCADE; Which two statements regarding the above command are correct?（） [" All the objects of scott are moved to the Recycle Bin."," Any objects in the Recycle Bin belonging to scott are purged."," All the objects owned by scott are permanently dropped from the database."," All the objects of scott in the Recycle Bin must be purged before executing the DROP command."," Any objects in the Recycle Bin belonging to scott will not be affected by the above DROP command."]
住宅分户水表前宜安装（）。 ["止回阀","闸阀","安全阀","截止阀"]
礼俗社会
