IP地址192.168.1.7/28的子网掩码为() ["255.255.255.240","255.255.255.248","255.255.255.224","255.255.255.252"]
VLSM的含义是() ["VariableLength Subnet Masking","VariableLength Shortest Masking","VeryLong/ Shortest Masking","VariableLong Subnet Masking"]
怎样认识“烂喉丹痧以畅汗为第一要义”?
用混凝土泵输送混凝土,其骨料粒径必须小于()mm。 ["50;","45;","40;","35。"]
V.35在同步工作模式下最大传输速率是() ["64Kbps","9200bps","56kbps","2048kbps"]
可以做为设计和投资依据的储量为()。