单项选择题
A．DES B．RC-5 C．IDEA D．RSA
A．/etc/hosname B．/etc/hosts C．/etc/resolv.conf D．/etc/networks
A．drwx----1 hel users 1024 Sep 10 08:10 aaa B．-rw----2 hel-s users 56 Sep 09 11:05 bbb C．brw----2 hel-s users 56 Sep 09 11:05 ccc D．1rwx----1 hel users 2024 Sep 12 08:12 ddd