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1.（），所以露点也直接反映空气中水汽含量多少的物理量。
单选题A. 露点越低，水汽含量越多~||~露点越低，水汽含量越少~||~露点高低不能反映水汽含量的多少~||~露点温度越高，水汽越不容易凝结
2.The circular steel structure installed around the propeller of a towboat is the______．
单选题A. nozzle~||~shroud~||~strut~||~Hood
3.PUBLIC ADDRESS SYSTEM:LOUDSPEAKERS IN THE VESSEL’S CABINS, MESS ROOMS, ETC., AND ON DECK VIA WHICH IMPORTANT INFORMATION CAN BE BROADCAST FROM A CENTRAL POINT, MOSTLY FROM THE NAVIGATION BRIDGE defines ______.
单选题A. AA-system~||~PP-system~||~PA-system~||~AP-system
4.6和12nmile量程上有效，跟踪距离应至少延伸至（）。
单选题A. 10nmile~||~11nmile~||~12nmile~||~13nmile
5.南赤道流由几内亚湾开始，沿着约4°N～10°S之间（），属于中性流。
单选题A. 向西流动~||~向东流动~||~向西南流动~||~向西北流动
6.在海平面上大气压为1013hpa，高度每升高1000英尺(304.8m)，降低（）
单选题A. 35hpa~||~36hpa~||~37hpa~||~38hpa
7.Fishing stake, the position of which frequently _____, exist in the area covered by this chart.
单选题A. removed~||~altered~||~corrected~||~Converted
8.海上副热带高压中部的天气特点是（）
单选题A. 风弱，闷热，多阵雨~||~风强，对流旺盛，多阵雨~||~风弱，闷热，万里无云~||~风强，干爽，万里无云
9.Do not______the watch to the relieving officer until he has verbally expressed his acknowledgment of the information which has been passed by the officer handing over．
单选题A. turnover~||~handover~||~handsoff~||~takeover
10.500hPa等压面的平均海拔高度约为（）
单选题A. 4500m~||~5000m~||~5500m~||~6000m
11.气团离开源地后，使气团发生变性慢的情况是（）
单选题A. 所经下垫面比气团冷~||~所经下垫面与气团温度相等~||~气团移动速度慢~||~所经下垫面比气团暖
12.My ship sailed______port of Shanghai，bound______Rotterdam．
单选题A. from，for~||~for，on~||~on，at~||~at，from
13.引起雷达测距随机误差的原因主要有（）
单选题A. 气象海况目标反射能力雷达设备能力~||~气象海况目标反射能力雷达较准~||~气象海况雷达较准雷达调整~||~雷达较准目标反射能力雷达设备能力
14.象灯塔、教堂尖顶及锥形浮标等这类锥形目标的反射性能很差，只有当雷达波与其母线（），其反射性能才和圆柱形目标相同
单选题A. 交叉时~||~平行~||~互相成180°角时~||~垂直时
15.A vessel on the high seas that is not under command shall display which of the following day signals？ ______
单选题A. Twoblackballs~||~Threeblackballs~||~Tworedballs~||~Threeredballs
16.温带气旋而言，表示风力（）
单选题A. 8～9级~||~10～11级~||~≥10级~||~12级
17.On no account can they cut it______it be fouled.
单选题A. Do~||~would~||~shall~||~should
18.If a weather bulletin shows the center of a low pressure system to be 100 miles due east of you, what winds can you expect in the Southern Hemisphere？ ______.
单选题A. South-southwesterly~||~North-northwesterly~||~South-southeasterly~||~North-northeasterly
19.降水主要来自高层云和（）
单选题A. 层云~||~雨层云~||~淡积云~||~积雨云
20.（）是常温下发生相变(固、气、液三态)的唯一大气成分，它也是造成云、雨、雪、雾等现象的主要物质源泉。
单选题A. 氮气~||~水汽~||~二氧化碳~||~臭氧
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