单项选择题
	A.cu -l tty2
	B.cu -dml tty2
	C.cu -dht Direct
	D.cu -s9600 -l tty2
单项选择题 Whichcommandwillshownetworkstatisticssuchaskernelmallocandmblkfailures?()
单项选择题 Whenenablingattyporttobeusedforacusession,whatmustbedoneonthesystem?()
单项选择题 WhichofthefollowinghasNOeffectoncontrollingtheaccesspermissionsneededtorunthe"date"commandontheremotemachine"Earth"usingthefollowingsyntax?rshEarthdate()。