单选题AIron and steel.BRubber and wood.CIron and wood.DRubber and steel.
单选题
A
Iron and steel.
B
Rubber and wood.
C
Iron and wood.
D
Rubber and steel.
参考解析
解析：
[考点]细节题。在讲建筑安全时，录音提到“In the past, people used steel and rubber.”。
[考点]细节题。在讲建筑安全时，录音提到“In the past, people used steel and rubber.”。
相关考题：
Permanent magnetism is found in ______.A.hard ironB.soft ironC.vertical iron onlyD.horizontal iron only
共用题干第三篇Iron DeficienciesExperts have observed for years that endurance athletes,particularly females,frequently have iron deficiencies.Now a new study by a team of Purdue University researchers suggests that even moderate exercise may lead to reduced iron in the blood of women."We found that women who were normally inactive and then started a program of moderate exercise showed evidence of iron loss,"says Roseanne M.Lyle,associate professor at Purdue.Her study of 62 formerly inactive women who began exercising three times a week for six months was published in the journal Medicine & Science in Sports & Exercise."Women who consumed additional meat or took iron supplements were able to bounce back,"she notes."But the new exercisers who followed their normal diet showed a significant decrease in iron levels."Iron deficiency is very common among women in general,affecting one in four female teenagers and one in five women aged 18 to 45,respectively.But the ratio is even greater among active women,affecting up to 80 percent of female endurance athletes.This means,Lyle says,that"too many women ignore the amount of iron they take in."Women of childbearing age are at greatest risk,since their monthly bleeding is a major source of iron loss.Plus,many health-conscious women increase their risk by rejecting red meat,which contains the most easily absorbed form of iron.And because women often restrict their diet in an effort to control weight,they may not consume enough iron-rich food,and are liable to experience a deficiency."The average woman takes in only two thirds of the recommended daily allowance of iron," notes another expert."For a woman who already has a poor iron status,any additional iron loss from exercise may be enough to tip her over the edge into a more serious deficiency,"notes the expert. Exercise can result in iron loss through a variety of mechanisms.Some iron is lost in sweat,and,for unknown reasons,intense endurance exercise is sometimes associated with bleeding of the digestive system.The best sources of iron,and the only sources of the form of iron most readily absorbed by the body,are meat,chicken,and fish.Good sources of other forms of iron include dates,beans,and some leafy green vegetables.Who will have a significant decrease in iron levels?A:All the women.B:All the inactive women.C:Women who start to do moderate exercise and follow their normal diet.D:Women who start to do moderate exercise and consume additional meat or take iron supplements.
共用题干第三篇Iron DeficienciesExperts have observed for years that endurance athletes,particularly females,frequently have iron deficiencies.Now a new study by a team of Purdue University researchers suggests that even moderate exercise may lead to reduced iron in the blood of women."We found that women who were normally inactive and then started a program of moderate exercise showed evidence of iron loss,"says Roseanne M.Lyle,associate professor at Purdue.Her study of 62 formerly inactive women who began exercising three times a week for six months was published in the journal Medicine & Science in Sports & Exercise."Women who consumed additional meat or took iron supplements were able to bounce back,"she notes."But the new exercisers who followed their normal diet showed a significant decrease in iron levels."Iron deficiency is very common among women in general,affecting one in four female teenagers and one in five women aged 18 to 45,respectively.But the ratio is even greater among active women,affecting up to 80 percent of female endurance athletes.This means,Lyle says,that"too many women ignore the amount of iron they take in."Women of childbearing age are at greatest risk,since their monthly bleeding is a major source of iron loss.Plus,many health-conscious women increase their risk by rejecting red meat,which contains the most easily absorbed form of iron.And because women often restrict their diet in an effort to control weight,they may not consume enough iron-rich food,and are liable to experience a deficiency."The average woman takes in only two thirds of the recommended daily allowance of iron," notes another expert."For a woman who already has a poor iron status,any additional iron loss from exercise may be enough to tip her over the edge into a more serious deficiency,"notes the expert. Exercise can result in iron loss through a variety of mechanisms.Some iron is lost in sweat,and,for unknown reasons,intense endurance exercise is sometimes associated with bleeding of the digestive system.The best sources of iron,and the only sources of the form of iron most readily absorbed by the body,are meat,chicken,and fish.Good sources of other forms of iron include dates,beans,and some leafy green vegetables.Who will show evidence of iron loss?A:Inactive women.B:Active women.C:Women who do a program of moderate exercises regularly.D:Women who are inactive and start to do moderate exercises.
Which of the following is not true of British iron and steel industry?（）A、Britain.s steel industry is declining.B、No more new discoveries of iron ore have been found in Britain.C、Supplies of iron ore are now mostly foreign.D、Compared with newer plants in the world,Britain.s steelworks are not efficient.
下列（）为通用橡胶。A、vulcanized rubberB、general purpose rubberC、special purpose rubberD、speciality rubber
单选题The cast iron was melted and _____ into sand molds as soon as possible.AregulatedBrelayedCpouredDoppressed
单选题An inflatable liferaft is hand-launched by（）.Apulling a cordBcutting the wire restraining bandsCremoving the rubber packing stripDthrowing the entire container overboard
单选题Cast irons weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittingsThe above sentence, most probably means （）.Acast iron has weaknessBcast iron can stand up shock loadingCcast iron fittings are only suitable in low pressure situationDeast iron fittings are not suitable in low pressure situation
单选题Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloysAccording to the above sentence , which of the following statements is true?（）AWrought iron can resist liquids flowBIt is difficult to attain the wrought ironCWrought iron should be combined with cuprous alloysDThe cuprous alloys have mere disadvantages than wrought iron
单选题Induced magnetism is found in（）.Ahard ironBsoft ironCvertical iron onlyDhorizontal iron only
单选题"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.Aeast iron is a cheap materialBcast iron can pollute sea waterCcast iron has mere corrosive than bronzes to sea waterDcast iron is more corrosive to sea water when it meets with bronzes
单选题Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fittings, those for high pressure and temperature are cast or mild steelIn the above sentence, the word “those” means （）.Aeast iron firingsBmild steel fittingsCsmall fittingsDlarge fittings
单选题Why did Macintosh wear the “rubber coat” on rainy days?ATo show his nice “rubber coat”.BTo sell it to a farmer.CTo test if it could keep off the rain.DTo go to work in the field.
单选题Which of the following is TRUE?AMacintosh worked in a market in Scotland.BThe rubber raincoat was created by chance.CThe first rubber raincoat was sticky in winter.DThe umbrella was invented after the rubber raincoat.
单选题Permanent magnetism is caused by（）.Aoperation of electrical equipment and generators on board shipBthe earth's magnetic field affecting the ship's hard iron during constructionCthe horizontal component of the earth's magnetic field acting on the horizontal soft ironDthe vertical component of the earth's magnetic field acting on the vertical soft iron
单选题The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）AThe Flinders barBThe heeling magnetCQuadrantal soft iron spheresDBar magnets in the binnacle
单选题Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）Atwice as large as with a cast iron pistonBthe same size as with a cast iron pistonChalf as large as with a cast iron pistonDthe same size as the crown of an aluminum piston
单选题Ireland is one of the leading exporters of（）in Europe.Acoal and iron oreBsilver and goldCcopper and aluminumDlead and zinc
单选题Which of the following is not true of British iron and steel industry?（）ABritain.s steel industry is declining.BNo more new discoveries of iron ore have been found in Britain.CSupplies of iron ore are now mostly foreign.DCompared with newer plants in the world,Britain.s steelworks are not efficient.