单项选择题
A. whether DMA is enabled
B. which DMA channels are in use
C. which DMA mode is in use
D. general information about DMA on the machine
单项选择题 WhichDebianpackagesystemcommandwilllistallpartiallyinstalledpackagesandsuggesthowtogetthemcorrectlyinstalled？（）
单项选择题 What is the output when the following shell script executes？（） cat<；<；foobar Hello foobar foobar
单项选择题 WhichsystemadministrationcommandyoucanusetoupdateId.so.cacheaftertheinstallationofnewsharedlibraries？（）