【单选题】
Mid（“I am a student.”，9，2）的返回值是什么？（）
A、“st”
B、“nt”
C、“tu”
D、“en”
查看正确答案
A、interface Ethernet0/0 I.pv6 traffic-filter NoULA out I.pv6 access-list NoULA Deny ipv6 FC00：：/8 any Permit ipv6 any any B、interface Ethernet0/0 I.pv6 traffic-filter NoULA out I.pv6 access-list NoULA Deny ipv6 FC00：：/7 anyP ermit ipv8 any any C、interface Ethernet0/0 I.pv6 access-group NoULA out I.pv6 access-list NoULA Deny ipv6 FC00：：/8 anyP ermit ipv6 any any D、interface Ethernet0/0 I.pv6 access-group NoULA out I.pv6 access-list NoULA Deny ipv6 FC00：：/7 any Permit ipv6 any any
