A. that B. which C. whose D. what
A. parties B. groups C. individuals D. departments
A. 所包含的子域名的个数通常不超过5个 B. 从左到右,子域的级别依次升高 C. 子域名之间可有“.”(小数点)或“\”斜杠符号)进行分隔 DSN用于主机名字与IP地址之间的自动转换
A. continue B. pass C. hold D. support
A. in B. at C. by D. on