第24题:[单选题] If your vessel is underway in fog and you hear one prolonged and three short blasts,this is a ______. A.vessel not under command B.sailing vessel C.vessel being towed(manned) D.vessel being towed(unmanned) 参考答案:C 【参考译文】如果你船在雾中航行,且听到一长三短,这是一艘配备人员的被拖船。 【解 析】manned配有人员的