Which one of the followings does not limit the effective range of radar ________．A.Pulse widthB.Pulse repetition frequencyC.Peak powerD.Target brightness
Which one of the followings does not limit the effective range of radar ________．
A.Pulse width
B.Pulse repetition frequency
C.Peak power
D.Target brightness
相关考题：
材料：What advantages does the eye have over the radar ？The eye has the following advantages： ReliableSensitive to colorCan assess headingCan identify small targetsCan see light configurationsCan assess ship typesCan identify conspicuous marksCan identify flashing lights Has better discriminationCan see changing weather patternsCan see effect of sea on vesselNot affected by blind arcs (if observer moves)．问题： BLIND ARCS mean ______ ．A.the arcs from which one can not see certain objectsB.the arcs which are blindC.the black arcsD.the arcs from which one can see certain objectsThis paragraph is a ______ ．A.a clause of a contractB.an explanation of advantage of eyes over radarC.a requirement from a governmentD.an article of ColregDISCRIMINATION means the ______ ．A.provisionB.dimensionC.distinctionD.permissionThe eye is more ______ than radar．A.distinguishableB.reasonableC.controllableD.reliable请帮忙给出每个问题的正确答案和分析，谢谢！
A vessel proceeding along the course of a narrow channel shall keep as near to the outer limit of the channel which lies on her starboard side as it is safe and practicable．Which one of the followings does the statement express？A.A vessel shall proceed near the other vessel on her starboard side on the narrow channel since it is safe and practicableB.A vessel shall avoid proceeding near the starboard outer limit of a narrow channel as long as it is safe and practicableC.A vessel shall avoid proceeding along the channel because it is not safe and practicableD.A vessel shall proceed near the starboard outer limit of a narrow channel to the degree in which it is safe and practicable
A radar range to a small，charted object such as a light will provide a line of position in which form?A.Straight lineB.ArcC.ParabolaD.Hyperbola
If the bill of lading ______ contain a space in which the shipper can insert the declared value of the goods，the Shipowner is not entitled to limit his liability．A.doesB.didC.does notD.will not
______of a radar is governed by the horizontal beam width of the scanner which depends to a great extent on its physical size．A.Range discriminationB.Bearing discriminationC.Echo discriminationD.Target discrimination
A vessel is approaching from dead ahead.Both of her sidelights are visible and her range lights are in line. Which of the following could you do first? ______.A.Sound one blast of the whistleB.Alter course to starboardC.Construct a radar plotD.Sound the danger signal
How can a SART’s effective range be maximized?______A.The SART should be placed in water immediately upon activation.B.The SART should be held as high as possible.C.Switch the SART into the “high” power position.D.If possible, the SART should be mounted horizontally so that its signal matches that of the searching radar signal.
Which of the following cable standards has a maximum effective range of 25 meters （82 feet）？（）A、1000Base-CXB、1000Base-TC、1000Base-LXD、1000Base-SX
单选题Which condition indicates that your radar needs maintenance?（）ASerrated range ringsBIndirect echoesCMultiple echoesDBlind sector
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 steeragewayBA look-out is not required if the radar is onCFog signals are only required when a vessel is detected by radarDThe radar should always be kept on a short-range scale
单选题Which of the followings does not belong to main maneuvering facilities?（）ArudderBpropellerCradarDsider thruster
单选题When using the ARPA in heavy rain，which action should you take? （）AIncrease the radar gain to pick up weak echoes through the rainBIncrease the STC setting to reduce close-in spurious signalsCNavigate as though the effective range of the radar has been reducedDIncrease the range of the inner and outer guard rings
单选题A navigator fixing a vessel’s position by radar （）.Acan use radar information from one object to fix the positionBshould never use radar bearingsCshould only use radar bearings when the range exceeds the distance to the horizonDmust use information from targets forward of the beam
单选题Which one of the followings does not limit the effective range of radar（）.APulse widthBPulse repetition frequencyCPeak powerDTarget brightness
单选题A vessel proceeding along the course of a narrow channel shall keep as near to the outer limitof the channel which lies on her starboard side as it is safe and practicable.Which one of the followings does the statement express?（）.AA vessel shall proceed near the other vessel on her starboard side on the narrow channel since it is safe and practicableBA vessel shall avoid proceeding near the starboard outer limit of a narrow channel as long as it is safe and practicableCA vessel shall avoid proceeding along the channel because it is not safe and practicableDA vessel shall proceed near the starboard outer limit of a narrow channel to the degree in which it is safe and practicable
单选题A vessel is approaching from dead ahead． Both of her sidelights are visible and her range lights are in line. Which of the following could you do first?（）.ASound one blast of the whistleBAlter course to starboardCConstruct a radar plotDSound the danger signal
单选题Which one of the followings may not be checked before engine starting?（）Atank levelBVarious filtersCDrainsDseawater temperature
单选题How can a SART’s effective range be maximized? （）AThe SART should be placed in water immediately upon activationBThe SART should be held as high as possibleCSwitch the SART into the high power positionDIf possible，the SART should be mounted horizontally so that its signal matches that of the searching radar signal
单选题Which one of the followings might not be employed to create vacuum for flash type evaporator? （）Ahigh-pressure steam-driven air-ejectorBmotor-driven vacuum pumpCwater-motivated air eductorDcentrifuge pump
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On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.Amimimum oxygen content lineBcritical displacement lineCcritical dilution lineDupper threshold limit
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Which of the following statements describes the relationship between viscosity and specific gravity?（）ALiquids with different viscosities will always have the same specific gravityBLiquids with different viscosities will never have the same specific gravityCViscosity and specific gravity are directly proportionalDViscosity and specific gravity are not related in that one does not define or limit the other
单选题The mere inclusion of an arbitration clause in a bill of lading to which the Hague Rules apply as a matter of contract does not deprive the carrier（）the one year time limit.AbyBtoCofDoff
单选题Which of the following radar contacts will present the most immediate danger?（）.AA vessel on the starboard bow whose bearing is changing and range is decreasingBA vessel on the starboard bow whose bearing is steady and range is increasingCA vessel on the port bow whose bearing is steady and range is decreasingDA vessel on the port bow whose bearing is changing to the left and range decreasing
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
单选题Which one of the followings is not required on survival crafts?（）AAnti-seasickness medicineBImmersion suitsCAxesDLifebuoys