The well-known ping program sends an (a) ____ type 8 code 0 message to the specified host. The destination hosts seeing the echo request, send back a type 0 code 0 ICMP echo reply.
【简答题】Sociolinguists are interested in 'terms of address' because they offer some socio-cultural information about the type of relationship between the speaker and the hearer.(上外2000年研)