Heat exhaustion is caused by excessive ______.A.loss of body temperatureB.loss of water and salt from the bodyC.gain in body temperatureD.intake of water when working or exercising
Heat exhaustion is caused by excessive ______.
A.loss of body temperature
B.loss of water and salt from the body
C.gain in body temperature
D.intake of water when working or exercising
相关考题：
If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is( ).A.a broken shaft on the freshwater pumpB.an excessive accumulation of scale in the heat exchangerC.an incorrect thermostatic element operating rangeD.lube oil in the cooling water
Low compressor head pressure in a refrigeration system can be caused by ___.A.insufficient condenser cooling waterB.excessive condenser cooling waterC.air in the refrigeration systemD.excessive refrigerant in the system
The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?A.Faulty thermostatic bypass valveB.Eroded zinc pencils in the heat exchangerC.Steam formation in the expansion tankD.Excessive leakage from jacket water pump seals
第二组The only attention that heat exchanger should require is to ensure that the heat transfer surfaces remain substantially clean and the flow passages generally clear of obstruction. Indication that undue fouling is occurring is given by a progressive increase in the temperature difference between the two fluids, over a period of time, usually accompanied by a noticeable rise in pressure loss at a given flow.Fouling on the sea-water side is the most usual cause of deterioration in performance. The method of cleaning the sea water-side surfaces depends on the type of heat exchanger. With shell-and-tube heat exchangers, the removal of the header covers or, m the case of the smaller heat exchangers, the headers themselves, will provide access to the tubes. Obstructions, dirt, scale etc., can then be removed, using the tools provided by the heat exchanger manufacturer. Flushing through with fresh water is recommended before a heat exchanger is returned to service. In some applications, such as piston oil cooling, progressive fouling may take place on the outside of the tubes. Most manufactures recommend a chemical flushing pr6cess to remove this in situ~ without dismantling the heat exchanger.Plate heat exchangers may be cleaned by unclamping the stack of plates and mechanically cleaning the surface of each plate as recommended by the manufacturers. The plate seals may require replacement from time to time and here the manufacturers instructions should be closely followedBy which of the following indication, can we conclude that the lube oil-sea water heat exchanger is unduly fouled?A.the heat exchanger lube oil inlet temperature loweringB.the heat exchanger sea-water outlet pressure riseC.the heat exchanger temperature difference between lube oil and sea water increasingD.the heat exchanger pressure difference between sea water inlet and outlet decreasing
Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?A.Leaking seal ringB.Insufficient heat transfer from the exhaust valvesC.Blocked cooling water passages to the headD.Excessive scavenging air provided to the engine
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?A.A shortage of liquid refrigerant.B.Excessive frost on the evaporator.C.Excessive condenser cooling water.D.Insufficient condenser cooling water flow.
A patient suffering from heat exhaustion should be______.A.moved to a cool room and told to lie downB.kept standing and encouraged to walk slowly and continuouslyC.given a glass of water and told to return to work after 15 minutes of restD.None of the above are correct
An underwriter is liable for ______.A.loss arising from the subject itself because of its inherent qualitiesB.loss caused by the ordinary evaporation of liquidsC.loss caused by heavy weatherD.the natural decay of the vessel due to the passage of time
The Insurance Company shall be liable for ______.A.loss or damage caused by unseaworthiness of the insured shipB.demurrage of the insured ship and other indirect expensesC.reasonable expenses for ascertaining the loss or damage within the scope of CoverD.A，B，C are all wrong
A protective suit which reduces the body heat-loss of a person wearing it in cold water is called______．A.water suitB.diving suitC.immersion suitD.swimming suit
共用题干第一篇Heat and HealthExtremely hot weather is common in many parts of the world.Although hot weather just makes most people hot,it can cause medical problems and death.Health experts say that since the year 1900,extremely hot weather has killed more people in the United States than any other natural event.One year一the unusually hot summer of 1980一heat caused about 1,700 deaths in the United States.In 1995,more than 600 people died in a similar heat wave in one city一Chicago.To measure extreme heat,government weather experts have developed the Mean Heat Index.It measures the average of how hot it is felt all day on an extremely hot day.Experts say it is the total heat of a hot day or several hot days that can affect health.Several hot days are considered a heat wave.Experts say heat waves often become deadly when the nighttime temperature does not drop much from the highest daytime temperature.The most common medical problem caused by hot weather is heat stress.It is also least severe.For most people,the only result of heat stress is muscle pain.The pain is a warning that the body is becoming too hot. Doctors say drinking water will help the pain disappear after the body again has the right amounts of water and salt.For some people, however,the result is much more serious.For example,doctors say some people face a greatly increased danger from heat stress.These people have a weak or damaged heart,high blood pressure,or other problems of the blood system.Severe heat can help cause a heart attack or stroke.Health experts say this is the most common cause of death linked to hot weather. A heat wave is a period of time during whichA:the weather is much better than usual.B:the nights are much longer than usual.C:the weather is much hotter than usual.D:the days are much longer than usual.
共用题干第一篇Heat and HealthExtremely hot weather is common in many parts of the world.Although hot weather just makes most people hot,it can cause medical problems and death.Health experts say that since the year 1900,extremely hot weather has killed more people in the United States than any other natural event.One year一the unusually hot summer of 1980一heat caused about 1,700 deaths in the United States.In 1995,more than 600 people died in a similar heat wave in one city一Chicago.To measure extreme heat,government weather experts have developed the Mean Heat Index.It measures the average of how hot it is felt all day on an extremely hot day.Experts say it is the total heat of a hot day or several hot days that can affect health.Several hot days are considered a heat wave.Experts say heat waves often become deadly when the nighttime temperature does not drop much from the highest daytime temperature.The most common medical problem caused by hot weather is heat stress.It is also least severe.For most people,the only result of heat stress is muscle pain.The pain is a warning that the body is becoming too hot. Doctors say drinking water will help the pain disappear after the body again has the right amounts of water and salt.For some people, however,the result is much more serious.For example,doctors say some people face a greatly increased danger from heat stress.These people have a weak or damaged heart,high blood pressure,or other problems of the blood system.Severe heat can help cause a heart attack or stroke.Health experts say this is the most common cause of death linked to hot weather. What can people learn from the Mean Heat Index?A:The average temperature of an extremely hot day.B:The highest temperature of an extremely hot day.C:The lowest temperature of an extremely hot day.D:The nighttime temperature of an extremely hot day.
共用题干第一篇Heat and HealthExtremely hot weather is common in many parts of the world.Although hot weather just makes most people hot,it can cause medical problems and death.Health experts say that since the year 1900,extremely hot weather has killed more people in the United States than any other natural event.One year一the unusually hot summer of 1980一heat caused about 1,700 deaths in the United States.In 1995,more than 600 people died in a similar heat wave in one city一Chicago.To measure extreme heat,government weather experts have developed the Mean Heat Index.It measures the average of how hot it is felt all day on an extremely hot day.Experts say it is the total heat of a hot day or several hot days that can affect health.Several hot days are considered a heat wave.Experts say heat waves often become deadly when the nighttime temperature does not drop much from the highest daytime temperature.The most common medical problem caused by hot weather is heat stress.It is also least severe.For most people,the only result of heat stress is muscle pain.The pain is a warning that the body is becoming too hot. Doctors say drinking water will help the pain disappear after the body again has the right amounts of water and salt.For some people, however,the result is much more serious.For example,doctors say some people face a greatly increased danger from heat stress.These people have a weak or damaged heart,high blood pressure,or other problems of the blood system.Severe heat can help cause a heart attack or stroke.Health experts say this is the most common cause of death linked to hot weather. Muscle pain in hot weather means that your body needsA:more exercise. B:more water.C:less oxygen. D:less sugar.
问答题Practice 1 Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surroundings. Therefore, when I am of sweat evaporate, a great deal of heat is absorbed from the surface of the body in contact with it. 1______ 2______ The first is the amount of movement of air surrounding the body. The second is the amount of water vapor in the air that surrounds the body. 3______ For this reason, sweat evaporates very rapidly on windy days, and the rate of heat loss by sweating is much more than on a still day. This accounts for the fact that hot still days are much less comfortable than hot windy days. In contrast, the sweat evaporates very rapidly on hot windy days, and cools the body quickly and effectively. 4______ When air is carrying the maximum amount of water vapor that it can hold, it is said to be 100% saturated with water vapor. The relative humidity of the air is said to be 100%. Under these conditions the air cannot carry any water, so no water can evaporate. When the relative humidity is high, therefore, sweat cannot evaporate. Instead, it forms large drops and runs off your skin without cooling you. 5______ It is obvious that under these conditions, evaporation will be much more rapid. Therefore, sweating will be much more effective as a method of losing heat from the body. On a hot dry day, sweat evaporates as soon as it is formed, and you feel reasonably cool even though the temperature of your environment is very high.[A] When the air is very dry and carries no water at all, the relative humidity is said to be 0%.[B] The second factor is the amount of water vapor in the air－the humidity.[C] Hot windy days are much more comfortable than hot still days.[D] This heat transfer occurs even if the environment is hotter than the body.[E] When air moves over the surface of water, the amount of evaporation is greatly increased.[F] You might expect the highest incidence of a heat stroke when the maximum temperature is 100 and humidity is 50%.[G] Two factors affect the rate of evaporation of sweat, and therefore the effectiveness of sweating as a method of cooling the body.
单选题A patient suffering from heat exhaustion should be（）.Amoved to a cool room and told to lie downBkept standing and encouraged to walk slowly and continuouslyCgiven a glass of water and told to return to work after 15 minutes of restDNone of the above are correct
单选题Symptoms of heat stroke are（）.Acold and moist skin，high body temperatureBcold and dry skin，low body temperatureChot and moist skin，high body temperatureDhot and dry skin，high body temperature
单选题Fighting a rig fire in the ballast pumproom with hoses would adversely affect the stability of the rig most by（）.Aincreasing the permeability of the pumproomBreduction of drill water from the storage tanksCa list caused by water filling the compartmentDa reduced KG caused by water filling the compartment
单选题Excessive vibration of an automatically fired auxiliary boiler can be caused by （）Aair or water in the furnaceBcombustion pulsesCfuel oil pump failureDflame failure
单选题The amount of heat released by steam when it changes to water at the same temperature is called（）.Alatent heat of condensationBlatent heat of vaporizationClatent heat of saturationDsensible heat of condensation
单选题Physical exertion on the part of a person who has fallen into cold water would（）.Abe the best thing to try if there was no rescue in sightBincrease survival time in the waterCincrease the rate of heat loss from the bodyDnot affect the heat loss from the body
单选题Excessive alkalinity of the water in an auxiliary boiler can cause （）.Acaustic embrittlement of the boiler metalBacidic corrosion of the boiler metalChard scale deposits on the boiler tubesDetching of the heat exchange surfaces
单选题One of the main purposes of refractories in a boiler furnace is to（）Ahelp preheat the air for the furnacesBhelp preheat the feedwaterCprotect economizer from excessive heatDprevent excessive furnace heat losses
单选题Treatments of heat exhaustion consist of（）.Amoving to a shaded area and laying downBbathing with rubbing alcoholCplacing the patient in a tub of cold waterDAll of the above
单选题Until recently, body heat has caused problems because it _____.Awas difficult to collectBcame in a variety of formsCwas difficult to get rid ofDtended to be absorbed by physical objects
单选题According to the T-Boat regulations the reason for providing adequate ventilation for a battery storage area is to prevent（）.Aaccumulation of carbon dioxide gas that chokes the batteryBaccumulation of explosive and toxic gases the battery can generateCmildew or dry rot in the battery boxDbattery failure including battery case meltdown caused by excessive heat