单选题When the density of water is 1000,i.e.in fresh water and in summer zone a ship may load to the upper edge of the line marked（）.ASBTCWDF
单选题
When the density of water is 1000,i.e.in fresh water and in summer zone a ship may load to the upper edge of the line marked（）.
A
S
B
T
C
W
D
F
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BThe world is not only hungry，it is also thirsty for water． this may seem strange to you，since nearly 75% of the earth is covered with water． But about 97% of this water is sea water．Man can only drink and use the other 3% fresh water that comes from rivers，lakes，under-ground and other places． And we cannot even use all of that，because some of this fresh water has been made dirty．At the moment，this small amount(数量) of fresh water is still enough for us． However，our need for water is getting greater and greater． Only if we take steps to solve this problem now，we can get away from a serious world water shortage later on． The people of the world cannot have an enjoyable life without enough clean water．On one hand we should stop wasting this little water of ours，on the other hand we should find ways to reuse it，but this has not been done widely．Today，in most large cities，water is used only once and it then returns to the sea or runs into underground places．lf we can make it clean again，it can be used once more just as if it were fresh from a spring．But even if large cities reuse its water，we still would not have enough in the future． Where．could we turn to next for water? To the ocean! How can we do to make use of this great a-mount of sea water? We can take the salt from the water to make it fresh．So if we take all these steps，we'll be in no danger of drying up!( )26． Why does the writer say that the world is thirsty for water?A． The amount of fresh water is really very small．B． The people of the world waste too much water．C． The people of the world have to drink a lot of water every day．D． There are too many people in the world needing water．
Prior to getting underway in fresh or brackish water，the Master must ______.A.log the density of the waterB.secure all overboard dischargesC.take on fresh water ballastD.clean the sides with fresh water
When is the density of the water required to be logged in the logbook of a ship?A.Any time the vessel moves from water of one density into waters of a different densityB.Prior to getting underway when the vessel is floating in fresh or brackish waterC.Only when the vessel moves from fresh water into salt waterD.The density of the water is not required to be logged in the unofficial logbook
When must the Master of a vessel log the position of load line marks in relation to the surface of the water in the Official Logbook?A.Once a dayB.At the change of every watchC.Only when in fresh or brackish waterD.Prior to getting underway
When must the Master or person in charge of a ship log the position of load line marks in relation to the surface of the water in the logbook?A.Once a dayB.At the change of every watchC.Only when in fresh or brackish waterD.Prior to getting underway
______is the number of millimeters by which the mean draft changes when a ship passes from salt water to fresh water，or vice versa，whilst floating at the loaded draft．A.TPCB.The Fresh Water AllowanceC.Parallel sinking of the shipD.UKC
水泥涂料用于淡水舱和双层底舱。（）A、Primer is used for sea water tanks and double bottom tanks.B、Cement wash is used for fresh water tanks and double bottom tanks.C、Varnish is used for fresh water tanks and double bottom tanks.D、Bitumen is used for fresh water tanks and double bottom tanks.
淡水注入管（）A、fresh water filling pipeB、sea water filling pipeC、ballast water filling pipeD、bilge water filling pipe
饮用水注入管（）A、fresh water filling pipeB、bilge water filling pipeC、drinking water filling pipeD、sea water filling pipe
单选题The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means （）.AstartersBpressure switchesCpressureDwater
单选题We use （） to distill fresh water from sea water.AengineBsea water pumpCcylinder coolerDfresh water generator
单选题The fresh water generator produces fresh water （）.Aby cooling sea waterBby heating sea waterCby evaporation of sea waterDby purifying sea water
单选题In a domestic fresh water system, the pump starters are controlled by （） switches which operate when the pressure in the tank varies within predetermined limits as water is drawn off.Awater levelBwater flowCtemperatureDpressure
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单选题（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.AThe fuel oilBThe lube oilCThe sea waterDThe fresh water
单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）Asea water temperature must never be warmer than 40℃Bjacket water pressure should always be greater than the sea water pressureCjacket water temperature must always be less than 60℃Djacket water pressure must always be less than the sea water pressure
单选题When must the Master of a vessel log the position of load line marks in relation to the surface of the water in the Official Logbook?（）AOnce a dayBAt the change of every watchCOnly when in fresh or brackish waterDPrior to getting underway
单选题_____ most of the earth's surface is covered by water, fresh water is very rare and precious.AAsBOnceCIfDAlthough
单选题When is the density of the water required to be logged in the logbook of a ship?（）AAny time the vessel moves from water of one density into waters of a different densityBPrior to getting underway when the vessel is floating in fresh or brackish waterCOnly when the vessel moves from fresh water into salt waterDThe density of the water is not required to be logged in the unofficial logbook
单选题In motorships，there are two main circuits, （）.Aone salt water, one fresh waterBone salt water, one fuelCone fresh water, one fuelDone steam, one fuel
单选题One of the causes of ocean currents is density differences in the water. This is true because （）.Ain an area of high density the water's surface is lower than in an area of low densityBsurface water flows from an area of high density to one of low densityCthe lesser the density gradient the freer the water is to moveDit is the density differences that cause the currents to stay in the troughs
单选题（）provides strength and strong space for fule,lubricating oil,fresh water,salt(ballast)water and potable water.AThe double bottomBThe cofferdamCThe navigating bridgeDThe superstructure
单选题Allowance for fresh water refers to（）.Athe provision to be provided when the vessel sails in fresh water areaBthe fresh water to be carried by a vesselCthe allowance of fresh water for each crew member when in distress at seaDthe amount of free board decreased when sailing in fresh water area
单选题Which statement concerning the collection of fresh water is FALSE?（）AFresh water may be obtained from fishBLifeboat covers or canopies should be washed with rain before drinking water is collectedCFresh water may be collected from condensation inside the liferaftDSeawater should never be consumed
单选题Prior to getting underway in fresh or brackish water，the Master must（）.Alog the density of the waterBsecure all overboard dischargesCtake on fresh water ballastDclean the sides with fresh water
单选题When must the Master or person in charge of a ship log the position of load line marks in relation to the surface of the water in the logbook?（）AOnce a dayBAt the change of every watchCOnly when in fresh or brackish waterDPrior to getting underway