The common way to obtain your ship’s position is(). keeping a close watch and lookout。 taking a radar range and bearing。 observing a radar target and listening to signals。 keeping a well clear cautio。
劳资协商决定事项落实情况评估的内容主要包括() 协议方案是否合理。 实施行动是否得力。 是否取得了预期的效果。
影响我国沿海地区的主要灾害性天气之一是() 龙卷风。 暴雨。 雷暴。 热带气旋或台风。
出现雷雨天气一要具备地面温度高,二是() 风力大。 气压低。 气压高。 大气湿度大。
The closest point of approach (CPA) of a contact on a relative motion radar may be determined(). immediately when the contact is noted on radar。 only if the radar scope is watched constantly。 after the contact has been marked at least twice。 by an occasional glance at the radar。
体育测量的基本要素()。