I________shore-based radar assistance.A.askB.look forC.requireD.in need of
I________shore-based radar assistance.
A.ask
B.look for
C.require
D.in need of
相关考题：
Radar beacons are transmitters designed to produce a ___ on the screens of ship’s radar sets.A.incorrect imageB.distinctive imageC.pictorial imageD.pictographic image
The closest point of approach ( CPA ) of a contact on a relative motion radar may be determined ______.A.immediately when the contact is noted on radarB.only if the radar scope is watched constantlyC.after the contact has been marked at least twiceD.by an occasional glance at the radar
The common way to obtain your ship’s position is ______.A.keeping a close watch and lookoutB.taking a radar range and bearingC.observing a radar target and listening to signalsD.keeping a well clear caution
My radar is not working．I require shorebased radar assistance．Is shorebased radar assistance ________ ？A.usedB.availableC.in useD.can be used
The description Racon beside an illustration on a chart would mean a ______.A.radar conspicuous beaconB.circular radiobeaconC.radar transponder beaconD.radar calibration beacon
Which aid is NOT marked on a chart with a magenta circle?A.Aero lightB.Radar stationC.Radar transponder beaconD.Radiobeacon
In order to insure that a RACON signal is displayed on the radar, you should ______.A.increase the brilliance of the PPI scopeB.turn off the interference controls on the radarC.use the maximum available range settingD.increase the radar signal output
In order to insure that the racon signal is visible on your 3 cm radar, the ______.A.10 cm radar should be placed on stangby or turned offB.gain control should be turned to maximumC.radar should be stabilized, head upD.rain clutter control should be off but, if necessary, may be on low
单选题Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.Aincorrect imageBdistinctive imageCpictorial imageDpictographic image
单选题Which conditions will normally cause a SART to operate in the active mode?（）AIt will respond only to interrogation by 9-Ghz radar signalsBA SART will normally respond to interrogation from a searching vessel's radar if the radar antenna is at least 15 meters highCA SART will normally respond to interrogation from a searching aircraft's radar if the radar's output power is at least 10，000 watts and the aircraft is at a height of 3000 feet and within 30 nautical milesDAll of the above
单选题It may be found that，in certain circumstances，radar beacon emissions can cause（）with the normal radar display，particularly at close range.Aunwanted interferenceBunexpected figuresCabnormal dataDunwanted information
单选题In determining a safe speed（）shall not be among those taken into account.Athe characteristics，efficiency and limitation of the radar equipmentBany constraints imposed by the radar range scale in useCthe effect on radar detection of the sea state，weather and other sources of interferenceDthe safe working load of the cranes both on board and ashore
单选题Which statement is true concerning a vessel equipped with operational radar?（）.AThe Master of the vessel must be on the bridge when the radar is in useBThe radar equipment is only required to be used in restricted visibilityCThe use of a radar excuses a vessel from the need of a look-outDThis equipment must be used to obtain early warning of risk of collision
单选题My radar is not working.I require shore based radar assistance.Is shore based radar assistance（）?AusedBavailableCin useDcan be used
单选题Which general statement concerning radar is FALSE?（）.ARaising the antenna height increases the radar rangeBThe ability of radar to detect objects is unaffected by weather conditionsCRadar bearings are less accurate than radar rangesDRadar should be checked regularly during clear weather to ensure that it is operating properly
单选题Which statement concerning the operation of radar in fog is TRUE?（）ARadar ranges are less accurate in fogBNavigation buoys will always show up on radarCA sandy beach will show up clearer on radar than a rocky cliffDSmall wooden boats may not show up on radar
单选题What is TRUE when operating in fog and other vessels are detected by radar?（）Ayou should make an ample change to port for a vessel crossing on the starboard bowBYou should maneuver in ample time if a close-quarters situation is developingCYou should determine the course and speed of all radar contacts at six minutes intervalsDLong-range scanning will provide early warning of all other vessels within the radar’s range
单选题Small floes of rough，hummocky sea ice capable of damaging a vessel（）.Acan usually be detected by radar in a smooth sea at a range of 4 to 6 kilometersBare indistinguishable from sea return on the PPICare invisible to radar when covered with a thick layer of snowDare usually seen at night before they are close enough to provide a radar echo
单选题The shoreline along Rocky Point should give a good radar return because（）.Athe shore is bluff and rockyBof offshore exposed rocksCsubmerged reefs cause prominent breakersDthe lookout tower is marked with radar reflectors
单选题You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）AYour speed must be reduced to bare steerage waysBA look-out is not required if the radar is onCThe radar should always be kept on a short-range scaleDFog signals are only required when a vessel is detected by radar
单选题In order to ensure that a RACON signal is displayed on the radar，you should（）.Aincrease the brilliance of the PPI scopeBturn off the interference controls on the radarCuse the maximum available range settingDincrease the radar signal output
单选题If there is any doubt as to the proper operation of a radar，which statement is TRUE?（）.AOnly a radar expert can determine if the radar is operatingBAll radars have indicator lights and alarms to signal improper operationCA radar range compared to the actual range of a known object can be used to check the operation of the radarDThe radar resolution detector must be energized to check the radar
单选题The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.Aimmediately when the contact is noted on radarBonly if the radar scope is watched constantlyCafter the contact has been marked at least twiceDby an occasional glance at the radar
单选题Which statement is TRUE concerning a vessel equipped with operational radar?（）.AShe must use this equipment to obtain early warning of risk of collisionBThe use of a radar excuses a vessel from the need of a look-outCThe radar equipment is only required to be used in restricted visibilityDThe safe speed of such a vessel will likely be greater than that of vessels without radar
单选题When using the radar for navigating（）.Athe best fix is obtained by using a tangent bearing and a rangeBand using two radar ranges for a fix，the objects of the ranges should be close to reciprocal bearingsCand using ranges，the most rapidly changing range should be measured lastDand crossing a radar range of one object with the visual bearing of a second object，the two objects should be 80°to 110°apart