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-0-一、海图及海图作业50题[251]Toagreewithlargerscalechart，latitudestakenfromthischartshouldbeincreased______about8seconds．A.withB.inC.byD.to[252]Onthischartonlytheprinciple______tonavigationareshown．A.equipment'sB.toolsC.apparatusD.aids[253]Manyofthesoundingsshownonthechartarederivedfrom_____.Unduerelianceshouldnotbeplaceduponthem．A.completeandoftenverypoorsurveysB.correctandoftenverygoodsurveysC.inadequateandoftenveryoldsurveysD.adequateandpresentsurveys[254]Linesonachartwhichconnectpointsofequalmagneticvariationarecalled______.A.magneticlatitudesB.magneticdeclinationsC.dipD.isogoniclines[255]Isogoniclinesarelinesonachartindicating___.A.pointsofequalvariationB.pointsofzerovariationC.themagneticlatitudeD.magneticdip[256]Inwhichsourcecouldyoufindthenumberofachartforacertaingeographicarea?______.A.ChartNo.1B.CatalogofChartsC.IMOPracticalNavigatorD.IMOLightList[257]Howistheannualrateofchangeformagneticvariationshownonapilotchart?______.A.GraylinesontheuppermostinsetchartB.RedlinesonthemainbodyofthechartC.InparenthesisonthelinesofequalmagneticvariationD.Annualrateofchangeisnotshown.[258]Charteddepthisthe______.A.verticaldistancefromthechartsoundingdatumtotheoceanbottom，plustheheightoftideB.verticaldistancefromthechartsoundingdatumtotheoceanbottomC.averageheightofwateroveraspecifiedperiodoftimeD.averageheightofalllowwatersataplace[259]ChartcorrectioninformationisNOTdisseminatedthroughthe______.A.SummaryofCorrectionsB.LocalNoticetoMarinersC.DailyMemorandumD.ChartCorrectionCard[260]Allstraightlinesrepresentgreatcircletracksonachartbasedona(n)______.A.MercatorprojectionB.polyconicprojectionC.orthographicprojectionD.gnomonicprojection[261]Arevisedprintofachartismade______.A.aftereverymajorhydrographicsurveyoftheareacoveredbythechartB.whentherearenumerouscorrectionstobemadeorthecorrectionsareextensiveC.whenalow-stocksituationoccursandminorcorrectionsaremadeD.everytwoyearstoupdatethemagneticvariationinformation[262]AMercatorchartisa______.A.cylindricalprojectionB.simpleconicprojectionC.polyconicprojectionD.rectangularprojection[263]______chart3994，positionsreadfromthischartshouldbeshifted0．03minutesNorthward．A.ToconsiderB.TocheckC.ToexamineD.Toagreewith[264]Thechangesinthechannel'ssandsandbuoysonthiscoastare______thischartcannotbeconsideredasasafeguideofthechannel．A.frequentB.sofrequent-1-C.frequentthatD.sofrequentthat[265]______isatermdenotingthedeterminationofaship'spositionbyobservationsofCelestialorterrestrialobjects，orbyacombinationofboth．A.Course-planningB.Position-fixingC.Radar-plottingD.Stowage-planmaking[266]Achartpositionenclosedbyasemi-circleisa(n)A.fixB.estimatedpositionC.deadreckoningpositionD.runningfix[267]Atruebearingofachartedobject，whenplottedonachart，willestablisha______.A.fixB.lineofpositionC.relativebearingD.range[268]AdmiraltyChartsarepublishedin______.A.U．S．AB.ChinaC.U．KD.Japan[269]Attentionis______theadviceontheuseofchartsinTheMariner'sHandbookChapter3，Section1．A.fixedtoB.neededforC.pushedtoD.drawnto[270]DistancealongatracklineismeasuredonaMercatorchartbyusingthe______.A.latitudescalenearthemiddleofthetracklineB.longitudescalenearthemiddleofthetracklineC.latitudescaleatthemidlatitudeofthechartD.latitudeorlongitudescaleatthemiddleofthescale[271]Enteringfromsea，adaymarkontheportsideofthechannelwouldbeindicatedonachartbya______.A.redtrianglewiththeletterRB.whitetrianglewiththelettersRGC.greensquarewiththeletterGD.whitesquarewiththelettersGR[272]Magneticinformationonachartmaybe______.A.foundinthecenter(s)ofthecompassrose(s)B.indicatedbyisogoniclinesC.foundinanoteonthechartD.Alloftheabove[273]Mypositionhasbeenobtained______astronomicalobservation．A.withB.fromC.onD.by[274]Navigationalchartsare______frequentchanges，theimportantoneofwhicharepromulgatedbyAdmiraltyNoticestoMariners．A.publishedwithB.combinedwithC.inconnectionwithD.subjectto[275]OnthesouthandtheeastcoastsofBlockIslandarecircleswithadotinthecenterandlabeledCUP.Thisisa______.A.conspicuousobjectB.steepdepressioninthesurroundinghillsthatresemblesacupC.domedstructureusefulfornavigationD.calling-up-pointusedfortrafficcontrol[276]Solidgreenarrowsonthemainbodyofapilotchartindicate______.A.prevailingwinddirectionsB.prevailingoceancurrentdirectionsC.probablesurfacecurrentflowD.shortestgreatcircleroutes[277]Theagoniclineonanisomagneticchartindicatesthe______.A.magneticequatorB.magneticlongitudereferencelineC.pointswherethereisnovariationD.pointswherethereisnoannualchangeinvariation[278]Thebuoysymbolprintedonyourchartisleaningtothenortheast.Thisindicates______.-2-A.youshouldstaytothenorthoreastofthebuoyB.youshouldstaytothewestorsouthofthebuoyC.thebuoyisamajorlightedbuoyD.nothingspecialfornavigationalpurposes[279]Thechartofabeachareashowsaveryflatslopetotheunderwaterbeachbottom.Whattypeofbreakerscanbeexpectedwhentryingtolandaboatonthisbeach?A.SurgingB.SpillingC.PlungingD.Converging[280]Thechartsymbolindicatingthatthebottomiscoralis______.A.CB.ClC.CoD.c[281]Thechartssoldareof______.A.newlyeditionwithuptodatecorrectionandinreasonableprices．B.thecurrenteditionandin