CIt is desirable to have screens on the vents of potable water tanks to ______．A.Filter the incoming airB.Prevent explosionsC.Prevent backupsD.Stop insects from entering
CIt is desirable to have screens on the vents of potable water tanks to ______．
A.Filter the incoming air
B.Prevent explosions
C.Prevent backups
D.Stop insects from entering
相关考题：
In no case shall ballast water be carried in cargo tanks，______ on those rare voyages when weather conditions are so severe that，in the opinion of the master，it is necessary to carry additional ballast water in cargo tanks for the safety of the ship.A.besidesB.in particularC.incase ofD.except
Which statement is TRUE concerning protection of double bottom tanks against excessive pressure?A.Each vent for the tank must be equal to the area of the tank filling lineB.The tanks must be protected by overflowsC.The total area of the vents or the overflow shall be at least equal to the area of the fill lineD.There must be twice as much vent area as the area of the fill line
You have water washed your cargo tanks using the fixed machines．What should you do before using portable machines to clean areas screened from the wash of the fixed machine by structural members ________．A.Ventilate the tank to eliminate any electrostatically charged mistB.Attach the water supply hose to the portable machine after the cleaning head is positioned inside the tankC.Insure that the tanks are not stripped until the final wash is startedD.Ground the fixed machines to eliminate any electrostatic buildup on the cleaning head
The tops of vents from gasoline tanks should terminate ______．A.in open airB.inside cabinsC.in machinery spaceD.underwater
Regulations require that cargo tanks carrying grades D or E liquids on tank barges be vented with ______．A.Gooseneck vents and flame screensB.Pressure-vacuum relief valvesC.Branch vent lines and a vent headerD.Forced draft blowers
The capacity of the segregated ballast tanks shall be ______ determined that the ship may operate safely on ballast voyages without recourse to the use of cargo tanks for water ballast except as provided otherwise．A.SuchB.AsC.SoD.Well
What represents poor sanitary procedures ________．A.Keep and use a separate filling hose for potable（drinking）waterB.Locate potable（drinking）water tanks as low as possible in the bilgeC.Eliminate enclosed spaces in which trash，food particles，dirt may gatherD.After washing dishes with soap and warm water，sterilize them in water of at least 170℉（76.7℃）
During which condition should be operator of a pedestal crane shutdown operations?A.BunkeringB.High windsC.Potable water spill on deckD.More than 3°list
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.
单选题The abbreviation "TDS" about the potable water probably means （）.Atotal dissolved solidsBtemperature of distillation of sea waterCtotal dissolved sodiumDtotal delivery system
单选题During loading and discharging operations，in addition to when the cargo tanks have been properly filled，each inert gas system must be capable of maintaining a minimum gas pressure of（）.A150 millimeters of water pressureB125 millimeters of water pressureC100 millimeters of water pressureD75 millimeters of water pressure
单选题The tops of vents from gasoline tanks should terminate（）.Ain open airBinside cabinsCin machinery spaceDunderwater
单选题Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?（）AHydrochloric acidBChlorineCSulfuric acidDZinc chromate
单选题Vents are led from the engine to the head tank for the release of （） from the cooling water.AairBheatCsludgeDsteam
单选题Regulations require that cargo tanks carrying grades D or E liquids on tank barges be vented with（）.Agooseneck vents and flame screensBpressure-vacuum relief valvesCbranch vent lines and a vent headerDforced draft blowers
单选题Normally，potable water systems are connected directly to the（）.Afire-main systemBfeed-water systemCfreshwater sanitary systemDdomestic water tank
单选题According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.Apressure vacuum relief valvesBexcess flow valvesCsafety relief valvesDflame screens
单选题Distilled water from an evaporator may be discharged into a potable water tank （）.Athrough a detachable hose connectionBafter passing through an activated charcoal filterCafter chemical analysis shows it is fit for consumptionDthrough a solenoid operated three-way valve
单选题Most covered lifeboats will right themselves after capsizing if the（）.Apassengers are strapped to their seatsBfuel tanks are not less than half fullCsea anchor is deployed to windwardDlower ballast tanks are filled with water
单选题The fuel from the bunker tanks must be treated by before entering the service tanks（）, from where the fuel enters（）Acentrifugal separators; the engine cylinderBoily water separators; the engine cylinderCoily water separators; the fuel supply systemDcentrifuges; the fuel supply system
单选题Where should the tops of vents from gasoline tanks terminate?（）.AIn open airBInside cabins near the overheadCIn the machinery space near the engine air intakeDUnderwater
单选题“Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired, or at least patched up temporarily until the next stop” This sentence means that （）.AAny leaks in piping, propeller shaft, machinery, tanks, will have to be repaired on the spotBAny leaks in piping, propeller shaft, machinery, tanks, will have to be repaired on the next port of callCAny leaks in piping, propeller shaft, machinery, tanks, will have to be repaired until the next stopDAny leaks in piping, propeller shaft, machinery, tanks, will have to be at least patched up
单选题Sufficient cargo tanks shall be（）prior to each ballast voyage in order that，taking into account the tanker’s trading pattern and expected weather conditions，ballast water is put only into cargo tanks which have been crude oil washed.AinertedBcrude oil washedCgas freedDbatterned down
单选题Which of the following statements describes one of the functions of the ballast system?（）ATo permit flooding of any fuel oil storage tank on any class of shipBTo use it as a secondary service systemCTo store reserve feed or potable water for extended cruisesDTo stabilize the ship by flooding certain designed tanks with seawater
单选题Which statement is TRUE concerning protection of double bottom tanks against excessive pressure? （）AEach vent for the tank must be equal to the area of the tank filling lineBThe tanks must be protected by overflowsCThe total area of the vents or the overflow shall be at least equal to the area of the fill lineDThere must be twice as much vent area as the area of the fill line
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After extinguishing a paint locker fire using the fixed CO2 system，the next action is to have the space（）.Aopened and burned material removedBleft closed with vents off until all boundaries are coolCchecked for oxygen contentDdoused with water to prevent reflash