银行汇票签发成功的业务状态为（）。 ["已记账","已清算","已冲正","已撤销"]
论述电力系统中有功功率最优分配的概念。
In heavy seas you decide to heave to. The lifeboat should be（）. ["brought to a position with the stern into the seas","allowed to take its own head","brought to lay in the trough","brought bow into the sea"]
访问某网站，想跟踪从你的机器到目标网站所经过的路径，需要（）命令。 ["ping","ipconfig","tracert","pathping"]
关于个人住房贷款借款人购买房屋财产保险表述正确的是（） ["按所购房屋总价款购买保险","按贷款金额购买保险","自行选择是否购买保险","一律不用购买保险"]
怎样检修交流接触器？
