After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell. What does this mean?______.A.The unit is working properlyB.The face mask is not sealed properlyC.The air bottle needs to be refilledD.The air supply hose has a leak
After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell. What does this mean?______.
A.The unit is working properly
B.The face mask is not sealed properly
C.The air bottle needs to be refilled
D.The air supply hose has a leak
相关考题：
On a ship, the locker or space containing the self-contained breathing apparatus must _____.A.be located in close proximity to the main control stationB.be equipped with battery powered emergency lightingC.be marked SELF-CONTAINED BREATHING APPARATUSD.All of the above
Self-contained breathing apparatus is used to ______.A.make underwater repairs to bargesB.determine if the air in a tank is safe for menC.enter areas that may contain dangerous fumes or lack oxygenD.resuscitate an unconscious person
What is the minimum period of time that the air supply for a self-contained breathing apparatus is required to last?________.A.10 minutesB.20 minutesC.30 minutesD.90 minutes
According to SOLAS the breathing air apparatus that must be onboard shall have sufficient capacity for how many minutes of operation?____.A.20B.30C.45D.60
You are in a tank wearing the self-contained breathing apparatus and you desire to return topside．How many tugs of the lifeline mean to take up the slack ________．A.OneB.TwoC.ThreeD.Four
The bypass valve on a self-contained breathing device should be opened if ______．A.You are entering a space containing poisonous vaporsB.You are entering a space containing explosive gasesC.The regulator of the breathing apparatus malfunctionsD.The face piece of the breathing device is too tight
The function of the bypass valve on the self-contained breathing apparatus is to ______．A.control the pressure of the oxygen as it enters the bodyB.allow the wearer to manually give himself oxygenC.release excess heat which would otherwise cause the bottle to explodeD.allow exhaled gases to pass outside the bottle
Gas masks ______.A.should be worn while fighting a fireB.can be used in atmospheres deficient in oxygenC.filter contaminants from air that is to be breathedD.may be substituted for a self-contained breathing apparatus
You work as the IT professional in an international company which is named wikigo. You are experienced in implementing and administering a network operating system. You are specialized in configuring IP addressing and services, configuring name resolution and network access and so on. Your company has a server named printer a that runs windows server 2008. Printer a has the print services server role installed. You have to reduce the so what action should you perform?（）A、After you open the print management console, you should open the properties of each individual printer on printer A and clear the enable advanced printing features option.B、After you open the event viewer console, a custom view for the system log should be created. Exclude the events that are notified by event ID 10 from the filter.C、After you open the print management console, you should open the properties of printer A and clear the log spooler information events option.D、After you open the print management console, you should open the properties of printer A and clear the show informational notifications for network printers option.
单选题The bypass valve on a self-contained breathing device should be opened if（）.Ayou are entering a space containing poisonous vaporsByou are entering a space containing explosive gasesCthe regulator of the breathing apparatus malfunctionsDthe face piece of the breathing device is too tight
单选题Which item is NOT included in the fireman’s outfit on a cargo vessel?（）AFire axBFlashlightCrigid helmetDFresh air breathing apparatus
单选题Clean air standards referred to as “Grade D” apply to compressed air for use in（）.Ahigh pressure fluid accumulatorsBdriving air-powered plunger pumpsCfilling open-circuit breathing systemsDbladder-type accumulators
单选题Gas masks（）.Ashould be worn while fighting a fireBcan be used in atmospheres deficient in oxygenCfilter contaminants from air that is to be breathedDmay be substituted for a self-contained breathing apparatus
单选题A self-contained breathing apparatus is used to（）.Amake underwater repairs to bargesBdetermine if the air in a tank is safe for menCenter areas that may contain dangerous fumes or lack oxygenDresuscitate an unconscious person
单选题When an auxiliary boiler is panting and emitting black smoke, you should （）.Aincrease the fuel oil temperatureBdecrease the fuel oil temperatureCdecrease the fuel oil supply pressureDincrease the air supply
单选题Fire protection regulations for towing vessels require training in all of the following，EXCEPT（）.Aputting on a fireman's outfit，if the vessel is so equippedBdonning a self-contained breathing apparatus，if the vessel is so equippedCactivating the general alarm and reporting inoperative alarm systems and fire-detection systemsDrefilling and servicing all expended fire extinguishing equipment
单选题You notice smoke coming from an open laundry room doorway．After activating the fire alarm，which of the following would you do FIRST（）.AAttempt to determine what is burningBAcquire the nearest self contained breathing apparatusCBreak out the nearest fire hoseDWait for the fire team to arrive and assist as directed
单选题After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell.What does this mean?（）.AThe unit is working properlyBThe face mask is not sealed properlyCThe air bottle needs to be refilledDThe air supply hose has a leak
单选题If you are unable to stop a diesel engine by any other means，you should（）.Adischarge a CO2 extinguisher in the air inletBpull off the distributor capCsecure the jacket waterDsecure the starting air supply valve
单选题The function of the bypass valve on the self-contained breathing apparatus is to（）.Acontrol the pressure of the oxygen as it enters the bodyBallow the wearer to manually give himself oxygenCrelease excess heat which would otherwise cause the bottle to explodeDallow exhaled gases to pass outside the bottle
单选题Which emergency equipment should you keep near the towing bitts（）.AA self-contained breathing apparatusBA boat hook and a spanner wrenchCA fire ax and/or cutting torchDA Stokes litter basket
单选题Which emergency equipment should you keep near the towing bitts? （）AA self-contained breathing apparatus (SCBA)BA boat hook and a spanner wrenchCA fire ax and/or cutting torchDA Stokes litter basket
单选题You are about to enter a compartment to investigate a suspected smoldering fireIf youre not wearing a self-contained breathing apparatus, you should test the compartments atmosphere to determine if there is/are （）.Asufficient oxygen to sustain human lifeBan explosive mixture in the compartmentCa toxic atmosphere in the compartmentDAll of the above
单选题Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）ABecause carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiationBBecause carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gasCBecause carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gasDThis action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively harmless gas
单选题A ship must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement，you may use（）.Aa gas mask certified by the Mine Safety and Health AdministrationBthe same self-contained breathing apparatus required with the fireman's outfitCan oxygen breathing apparatus，provided that the device has been inspected within three yearsDa portable ventilation system that will provide a complete change of air every three minutes