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1.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
2.大气中的()是温室气体,它对太阳短波辐射吸收甚少,强烈吸收和放射长波辐射,对地面和大气的温度分布有重要影响,类似温室效应。
单选题A. 氧气~||~水汽~||~臭氧~||~二氧化碳
3.()为南海季风转换月份,风向不稳定,海流处于转换之中,比较零乱。
单选题A. 1月和7月~||~3月和9月~||~4月和10月~||~6月和12月
4.If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position, what winds can you expect in the Northern Hemisphere?______.
单选题A. Easttonortheast~||~Easttosoutheast~||~Northtonorthwest~||~Southtosoutheast
5.罗北偏离真北的角度称为()
单选题A. 磁差~||~自差~||~罗经差~||~陀罗差
6.In beaufort wind scale,sea state with moderate waves,taking longer form,many whitecaps and some spray,is named as______.
单选题A. Strongbreeze~||~Freshbreeze~||~Stronggale~||~Gale
7.某轮候潮过浅滩时,需计算所需潮高,若某轮吃水7.5米,要求富裕水深0.5米,浅滩的海图水深4.3米,则通过浅滩所需的潮高为()。
单选题A. 27米~||~113米~||~37米~||~123米
8.当船上所有的测风仪器均失灵时,必须根据海面状况进行目力测风,()
单选题A. 风的观测项目可以缺测~||~在离岸较远的海面上,风向与主波向一致,可用罗经测定主波向作为风向~||~在离岸较远的海面上,风向与涌浪来向一致,可用罗经测定涌浪来向作为风向~||~在离岸较远的海面上,风向与风浪来向一致,可用罗经测定风浪来向作为风向
9.In what units are heights and soundings in the chart? They are in ______.
单选题A. metersandfathoms~||~fathomsandmeters~||~meterandfathom~||~fathomandmeter
10.()是一种典型的”陆雾”,在海面上通常不能产生。
单选题A. 锋面雾~||~平流雾~||~蒸汽雾~||~辐射雾
11.极地大陆气团(Polar continental air mass):(),空气层结稳定。
单选题A. 干燥低温天气晴朗~||~低温潮湿多阴天~||~干燥低温气层不稳定~||~干燥低温常阴天
12.Get searchlight______for transiting the canal at night.
单选题A. on~||~already~||~Almost~||~ready
13.属于硬铁校正器,主要用于校正船舶垂直硬铁船磁力在船舶摇摆时对罗经产生的()
单选题A. 象限自差~||~半圆自差~||~倾斜自差~||~椭圆自差
14.地理经度和地理纬度的度量范围分别是()
单选题A. 0~90o,0~90o~||~0~180o,0~180o~||~0~90o,0~180o~||~0~180o,0~90o
15.In the Northern Hemisphere, when the wind at your location is northerly, the low pressure center causing the wind is located to your ______.
单选题A. NNW~||~WSW~||~ESE~||~SSW
16.太平洋的西风漂流()越过南太平洋时,在南美西岸有一分支北上形成秘鲁海流,其流速约为0.5kn,属于冷流。
单选题A. 自北向南~||~自南向北~||~自东向西~||~自西向东
17.How many GMDSS operators are needed/required on board according to the provisions of the International Convention for the Safety of Life at Sea,1974?______.
单选题A. 4operators~||~3operators~||~2operators~||~1operator
18.当船舶航行在环行航道区域时,应()
单选题A. 在环行航道内,船舶向右绕分隔点或圆形分隔带航行~||~在环行航道内,船舶按顺时针方向绕分隔点或圆形分隔带航行~||~在环行航道内,船舶向左绕分隔点或圆形分隔带航行~||~在环行航道内,船舶出口时向左进口时向右绕分隔点或圆形分隔带航行
19.______get your engine ready before six tomorrow morning.
单选题A. You’dbetter~||~Youwouldbetter~||~Youatleast~||~Youatmost
20.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
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