不得设地漏的洁净区洁净级别应为()A、100级B、1000级C、l0000级D、10 发布时间:2017-07-15 13:48 │ 来源:www.tikuol.com 题型:单项选择题 B型题 问题: 不得设地漏的洁净区洁净级别应为()A、100级B、1000级C、l0000级D、100000级E、300000级
题型:单项选择题 B型题 An airplane wants a vessel to change course and proceed towards a vessel in distress. The actions of the aircraft to convey this message will NOT include().A.circling the vessel at least onceB.heading in the direction of the distress locationC.flashing the navigation lights on and offD.crossing ahead and rocking the wings 查看答案