有关Ports正确的是（）

A:是套接字的一部分 B:可以设置的范围为1～1024 C:HTTP服务的端口号为80 D:是协议设置好的，不能认为改动

ports of call

A regular service between fixed sea ports is（ ）.

A:tramp service B:liner service C:door to door service D:forwarding service

Copenhagen is one of the ports of ______.

A:Finland B:Denmark C:France D:Germany

Copenhagen is one of the ports of ______.

A:Finland B:Denmark C:France D:Germany

Copenhagen is one of the ports of ______.

A:Finland B:Denmark C:France D:Germany

Copenhagen is one of the ports of ______.

A:Finland B:Denmark C:France D:Germany