三副航海英语习题讲解2

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1、2017航海英语复习二Keyword8:chart8-1chartprojection(12)A58.AMercatorchartisa________.A.cylindricalprojectionB.simpleconicprojectionC.polyconicprojectionD.rectangularprojection【知识点】墨卡托投影【解析】A、圆柱投影B、单圆锥投影C、多圆锥投影D、正交投影注：相关题目B84.Theonlycylindricalchartprojectionwidelyusedfornavigationisthe__

2、____.A.LambertconformalB.MercatorC.AzimuthalD.GnomonicC59.Onamercatorchart,1nauticalmileisequalto______.A.1minuteoflongitudeB.1degreeoflongitudeC.1minuteoflatitudeD.1degreeoflatitude【知识点】墨卡托投影【解析】墨卡托投影中，1海里的长度为纬度1分。A61.DistancealongatracklineismeasuredonaMercatorchartbyusingthe__

3、____.A.latitudescalenearthemiddleofthetracklineB.longitudescalenearthemiddleofthetracklineC.latitudescaleatthemidlatitudeofthechartD.latitudeorlongitudescaleatthemiddleofthescale【知识点】纬度渐长【解析】trackline航迹线注：相关题目B102.WhydodistancesalwayshavetobemeasuredfromthenearestscaleonaMercator

4、chart?A.becauseitisthemostefficientwayB.becauseitvariesforeachlatitudeC.becauseitvarieswiththechangeoflongitudeD.becauseitisthemoststraightlineC101.WhichoneofthefollowingisincorrectaboutMercatorprojection?A.itprojectsasphereontoacylinderB.becausetheresultingdistancebetweenlatitud

5、esareconstantlyincreasing,itisalsocalledprogressiveprojection.C.itcanalwaysgivetruedistances.D.itsadvantageisthatlongitudeandlatitudeareatrightangles,whichmakes【知识点】墨卡托投影【解析】progressiveprojection渐长投影D103.Howlongwould15minutesoflongitudebeatalatitudeof60degreesnorth?A.30nmileB.60n

6、mileC.5nmileD.7.5nmile【知识点】墨卡托投影【解析】假设地球是个标准的球体，如图所示，地球的半径（也就是赤道的半径）为R，某个纬线圈的纬度为α，且该纬线圈的半径为r，则r=RcosαC90.Whatdefinesagreatcircle?A.acurvedlinedrawnonaMercatorchartB.acourselinethatinscribesaloxodromiccurveC.theshortestdistancebetweenanytwopointsontheearthD.thesmallestcirclethatca

7、nbedrawnonthefaceofasphere【知识点】大圆海图（心射投影）【解析】greatcircle大圆圈loxodromiccurve等角航线：与经线成相同角度的线。注：相关题目B260.Theshortestdistancebetweenanytwopointsonearthdefinesa______．A.smallcircleB.greatcircleC.rhumblineD.HyperbolaD56.Allstraightlinesrepresentgreatcircletracksonachartbasedona(n)______

8、.A.MercatorprojectionB.polyconicprojecti