[单选] 在Internet服务中，一般不使用公用名和公共口令的是（）。

RADSS型220kV母差保护在倒母线的操作过程中运行方式如何？ You are under sail and overtaking a tug and tow.Which action is correct（）. The power-driven tug must maneuver to avoid collision。 You must maneuver to avoid the tug and tow。 You must maneuver to avoid collision only if the tug is to leeward and the wind is on your port side。 Both vessels are required to maneuver to avoid collisio。 RADSS型母差保护屏上有哪些信号？ You are on a vessel that cannot comply with the spacing requirement for masthead lights.What is required in this situation（）. The vessel must carry only the lights that comply with the rules; the others may be omitted。 The vessel's lights must comply as closely as possible，as determined by her government。 The vessel must be altered to permit full compliance with the rules。 An all-round light should be substituted for the after masthead light and the stern light。 Telnet服务器起什么作用（）。 它是一个新闻组服务器。 它是一个聊天服务器。 它是一个远程登录服务器。 它是一般常用的服务器。 在Internet服务中，一般不使用公用名和公共口令的是（）。