单选题In a river subject to tidal currents，the best time to dock a ship without the assistance of tugs is（）.Aat high waterBwhen there is a following currentCat slack waterDat flood
单选题
In a river subject to tidal currents，the best time to dock a ship without the assistance of tugs is（）.
A
at high water
B
when there is a following current
C
at slack water
D
at flood
参考解析
解析：
暂无解析
相关考题：
What can be the best title for the text?A. A Mother’s Love B. A Brave ActC. A Deadly River D. A Matter of Life and Death
—Which subject do you like______?—I like chemistry than any other one.A. better, betterB. best, betterC. best, bestD. better, best
Gun control is a subject ____ Americans have argued for a long time.A．of whichB．with whichC．about whichD．into which
(15 minutes)Directions :Read the following text. Choose the best word or phrase for each numbered blank and mark A , B, C or D on ANSWER SHEET1.In addition to the established energy sources such as gas ,coal ,oil and nuclear ,there are a num-ber of other sources that we ought to consider. Two of these are hydroelectric and tidal power. These two sources are (21) in that they are both renewable. (22) ,hydropower is more widely used than tidal.ln (23) ,a substantial amount of electricity is already produced in HEP (hydroelectric power)stations worldwide, (24) tidal stations are stillin the very early (25) of development. .As far as geographical (26) is concerned ,HEP projects are to be found on lakes and rivers, whiletidal (27)are constructed only at river mouths where tidal (28) is great .Unfortunately these are (29) in number. At present HEP stations are found mainly in Norway ,Canada ,Sweden and Brazil ,whereas tidal plants are in (30) in France ,Russia and China.As regards capital (31) ,both require very high..investment. On the other hand ,generating(32) are quite low in both cases .ln fact,a large scale HEP plant is capable of producing power more (33) than conventional sources ,such as coal ,oil and nuclear plants. Tidal power also com-pares (34) with nuclear and oil generated electricity, (35) the amount of money on production.(36) HEP stations ,tidalconstructions have alonglife (37).Itis estimated thatthey can operate foroverl00 years. With respect to (38) 0f supply ,tidal stations (39) from HEP ones in that they often can only supply power (40). HEP stations ,however ,provide a constant supply of elec-tricity.21.[ A] compatible[ B ] parallel[ C] similar[ D] identical
The height of tide is the ______.A.depth of water at a specific time due to tidal effectB.difference between the depth of the water and the area's tidal datumC.difference between the depth of the water and the high water tidal levelD.difference between the depth of the water at high tide and the depth of the water at low tide
Data relating to the direction and velocity of rotary tidal currents can be found in the ______.A.Mariner's GuideB.Tidal Current TablesC.Nautical AlmanacD.Tide Tables
The Daily Memorandum contains information on ______.A.active weather disturbances such as hurricanes or tropical stormsB.the latest navigational warningsC.scheduled vessel arrivals and departures for a 24-hour periodD.water levels at river ports where run-off affects tidal heights
If you are sailing from the East Coast of the United States to the Caribbean Sea，which publication would contain information on weather，currents，and storms?A.Sailing Charts of the Caribbean SeaB.Pilot Charts of the North AtlanticC.Light Lists，Atlantic and Gulf CoastD.Tidal Current Tables
When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind，the approach is best made ______．A.With bow out，stern inB.With bow in，stern outC.Parallel to the dock，as close in as possibleD.Parallel to the dock，as far out as possible
材料：The Port of London comprises the 147km of the tidal River Thames，and the enclosed dock system at Tilbury．The limits of the port are from Teddington to those territorial waters within a limit as follows：from Foulness Point（Essex）to Gunfleet old lighthouse to 51°26′36′′N，01°25′30′′E to Warden Point（Kent），excluded is any part of the port as defined in the Medway Ports Reorganisation Scheme 1968；River Lea or Bow Creek within the jurisdiction of the British Waterways Board；The Grand Union Canal and Regents Canal Dock．For London District River Pilots the upper limit is London Bridge and the down river limit is just below Gravesend.For the London District Sea Pilots the upriver limit is an imaginary line from the Sealink ferry pier at Gravesend to Tilbury Passenger Landing Stage and the lower limit is a line running from Felixstowe across the mouth of the Thames outside the GOODwin Sands to Folkestone．The Thames Barrier，built for the Greater London Council at Woolwich Reach to afford protection against tidal floods is now under control of the Thames Water Authority．It allows shipping to and from the upper areas of the Port of London to pass without restriction during periods of non-surge conditions．Spanning 520m across the river，it comprises ten rising sector gates，of which four main gates for navigation have a width of 61m and two subsidiary gates have a width of 35m．问题：________ does not belong to the Port of London．A.River Lea or Bow Creek within the jurisdiction of the British Waterways BoardB.The Grand Union Canal and Regents Canal DockC.from Foulness Point（Essex）to Gunfleet old lighthouse to 51°26′36′′N，01°25′30′′E to Warden Point（Kent）D.any part of the port as defined in the Medway Ports Reorganisation Scheme 1968For the London District Sea Pilots the upriver limit is ________．A.London BridgeB.just below GravesendC.an imaginary line from the Sealink ferry pier at Gravesend to Tilbury Passenger Landing StageD.a line running from Felixstowe across the mouth of the Thames outside the GOODwin Sands to Folkestone________ is spanning 520m across the river，comprising ten rising sector gates，of which four main gates for navigation have a width of 61m and two subsidiary gates have a width of 35m．A.The Thames BarrierB.Felixstowe across the mouth of the ThamesC.Woolwich ReachD.Thames WaterThis passage is most likely extracted from ________．A.Guide to Port EntryB.Notices to MarinersC.Attachment to a Charter PartyD.Ocean Passage请帮忙给出每个问题的正确答案和分析，谢谢！
Fine freshwater pearls are found in the main stream and the tributaries of the Mississippi River.A:banksB:deltasC:branchesD:currents
Fine freshwater pearls are found in the main stream and the tributaries of the Mississippi River.A:banks B:deltasC:branches D:currents
事实记录如有下列批注，哪条批注可以接受（）？A、Subject to owner’s approvalB、For lay time record onlyC、Under protestD、In dispute
Which of the following NTP command specifies that a router is in the Eastern time zone， which isfive hours behind GMT？（）A、timezone EST -5B、clock timezone GMT -5C、dock GMT -5D、clock EST-5E、NTP timezone EST -5F、dock timezone EST -5
单选题What does the speaker think is the best place for running?AAlong a river bankBIn a sports groundCAlong street sidewalks
单选题Generally speaking，a ship steaming across the North Pacific from Japan to Seattle is likely to experience（）.Aadverse currents for practically the entire crossingBfavorable currents for practically the entire crossingCfavorable currents in the summer months and adverse currents in the winter monthsDvariable currents having no significant effect on the total steaming time
单选题River currents tend to（）.APick up speed where the channel widensBRun slower in the center of the channelCHug the inside of a bendDCause the greatest depth of water to be along the outside of a bend
单选题Your vessel has anchored in a channel known to have strong tidal currents. To check your position you take a round of bearings，one of which is a range in line. One hour later the bearing on the lights in range opens up. This indicates the ship is（）.AswingingBdredging her anchorCtaking bearings of the lightsDtaking distances of the lights
单选题The drift and set of tidal，river，and ocean currents refer to the（）.Aposition and area of the currentBspeed and direction toward which the current flowsCtype and characteristic of the current's flowDNone of the above
单选题The height of tide is the （）.Adepth of water at a specific time due to tidal effectBdifference between the depth of the water and the area's tidal datumCdifference between the depth of the water and the high water tidal levelDdifference between the depth of the water at high tide and the depth of the water at low tide
单选题（）offers a detailed description of tidal theory and its application to the analysis and prediction of tides and tidal streams.AOcean Passages for the WorldBAdmiralty Tidal Stream AtlasesCAdmiralty Manual of TidesDAdmiralty Tidal Handbooks
单选题Which is the best title of the passage?AThe best way to save timeBThe importance of planning timeCThe reason for time flying and dragging
单选题You are docking a vessel starboard side to with the assistance of two tugs.You are attempting to hold the vessel off by operating both tugs at right angles to the vessel and at full power.You must ensure that（）.Asteerageway is not taken offBthe bow doesn't close the dock firstCthe bow closes the dock firstDthe ship has no headway at the time
单选题The Daily Memorandum contains information on（）.Aactive weather disturbances such as hurricanes or tropical stormsBthe latest navigational warningsCscheduled vessel arrivals and departures for a 24-hour periodDwater levels at river ports where run-off affects tidal heights
单选题When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind，the approach is best made（）.Awith bow out，stern inBwith bow in，stern outCparallel to the dock，as close in as possibleDparallel to the dock，as far out as possible
单选题Data relating to the direction and velocity of rotary tidal currents can be found in the （）.AMariner's GuideBTidal Current TablesCNautical AlmanacDTide Tables