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
Prior to getting underway in fresh or brackish water，the Master must（）.
A
log the density of the water
B
secure all overboard discharges
C
take on fresh water ballast
D
clean the sides with fresh water
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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．
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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
Prior to getting underway，the Master or person in charge of a vessel must ______.A.conduct a fire drillB.conduct a boat drillC.log the fore and aft draft marksD.test the emergency generator
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
Topside area from deep loadline to bulwark to be thoroughly washed down with ______．A.highly pressure fresh waterB.high pressured fresh waterC.highly pressured fresh waterD.high pressure fresh water
______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
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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