以古代北京为都城的朝代有()①宋朝②元朝③明朝④清朝 ["①②","③④","②③④","①②③④"]
网络专题的特点是() ["互动性","持续变动性","非大众性","多媒体性"]
在波渠天线中,引向器的长度应()有源振子的长度。 ["A、短于","B、等于","C、长于","D、无所谓"]
县联社主任或分管主任对所辖营业单位()至少组织一次全面性的查库。 ["A、每年","B、每半年","C、每季","D、每月"]
以下属于DHCPSERVER发出的报文有()。 ["DHCP DISCOVER","DHCP ACK","DHCP INFORM","DHCP REQUEST"]
车票的开封?