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
A. dpkg-G B. apt-get-u C. dpkg-Dh D. dpkg-l E. apt-get-y
A. The contents of the file foobar. B. Hello C. No output but a file named foobar is created. D. Hello foobar E. Hello foobar foobar