网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
_____ no gravity, there would be no air around the earth.
A
Were there
B
There were
C
Was there
D
There be
参考答案
参考解析
解析：
原句为“If there were no gravity, there would be no air around the earth.”，省略之后变为“Were there no gravity, there would be no air around the earth.”虚拟语气中用were而不用was。
原句为“If there were no gravity, there would be no air around the earth.”，省略之后变为“Were there no gravity, there would be no air around the earth.”虚拟语气中用were而不用was。
更多 “单选题_____ no gravity, there would be no air around the earth.A Were thereB There wereC Was thereD There be” 相关考题
考题
The teacher said that the moon _______ round the earth.
(A) was moving(B) moved(C) would move(D) moves
考题
If there were life on Mars, such life forms( )unable to survive on earth.
A、isB、areC、would beD、will be
考题
BHave you ever wondered?1.Why do airplanes take longer to fly west than east?It can take five hours to go west-east from New York(NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon know as the jet(喷射) stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes movement a constams air speed thus go faster in the west-east direction when the air moving with the wind than in the opposite direction.2 What would happen if the gravity on Earth was suddenly turned off?Supposing we could magically turn off gravity. Would buildings and other structures float away? What happened would depend on how strongly the things were attached to the Earth. The Earth is moving at quite a speed moving at over a thousand miles per hour. If you turn something round your head on a string, it goes around in a circle until you let go of the strong go of the string. Things not attacked to the Earth would fly off in a straight line . People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling. Most things would fly off into space.60.What information coa we get from the first passage?A.tis the iet stoomn that affeets how fast airplanes fly.B.Planes go slower when they are moving with the wind.C.It takes more time to fly from NY to London than from London to NY.D.The jet stream always blows from the east to the west across the Atantic.
考题
It can be interred that without gravity .A.buildings and other structures would float awayB.trees and buildings would not so easily fly offC.something around your head would not float awayD.everything outside buildings would fly off into space
考题
______no air or water, there would be no life in the world.A. There wasB. There wereC. Is thereD. Were there
考题
Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?A.Cooling the air to a temperature just above dew pointB.Heating the air to a point at which moisture will boil off ,then re-cooling itC.Cooling the air to a point below dew point, then reheating itD.Heating the air and then cooling it to a point below dew point
考题
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.A. /; theB. the; /C. an; theD. the; a
考题
The experiment is carried cut to prove ______.A. water pushes on your body when you swim underwater.B. the earth is surrounded by a layer of air called the atmosphere.C. the pressure of air around us has a powerful force.D. the air pressure is not equalized around us.
考题
In Leon Nacson’s view, air and water are our Number One priorities for the following reasons except ().A、he cannot understand why people are polluting air and waterB、there will definitely be no fresh air and clean water for future generationsC、we would run out of air and water if we didn’t stop polluting themD、air and water polluting are the current and futu
考题
The air surrounding us is important to everyone. Without air, we could not （1） Everyone understands that. But air is necessary（2）many other ways that are not always so obvious or widely known. For example, if we did not have air, （3） would be no sound. Sound travels through air. Where there is no air, there is no sound. （4）air, there would be no fire. There would be no automobiles, （5） motors need air in order to operate. Without air there would be no wind or clouds. There would be no （6）, as we know it. The night time would be very（7）, the days very hot. We would be forced to seek shelter from the sun, （8）there would be no atmosphere to protect us from the sun’s deadly rays. The atmosphere is all the air surrounding the （9） . Atmosphere pressure is the weight of all that air against the （10）of the earth. If we did not have atmospheric pressure, we could not have automobile tires. The tires would swell or burst if they did not have the pressure of the atmosphere against their surface.1、 A. living B. lively C. exist D. alive2、 A. under B. of C. on D. in3、 A. there B. they C. it D. we4、 A. Despite B. With C. As D. Without5、 A. however B. but C. since D. and6、 A. air B. weather C. breeze D. climate7、 A. warm B. cool C. cold D. hot8、 A. as B. so C. that D. so that9、 A. floor B. ground C. land D. earth10、 A. top B. surface C. face D. coverage
考题
Would you please spare some time and ____ us around your campus?A、instructB、aidC、motionD、conduct
考题
According to this passage, if the cylinder non-return valve were not leakyA.an explosion would not be causedB.there still would be a danger of explosionC.oil would not deposit in the air pipeD.pipe lines would not have to be drained
考题
Combustible gas indicators operate by drawing an air sample into the instrument ______．A.Over an electrically heated platinum filamentB.Where it is mixed with nitrogenC.Where it is ignited by a sparking deviceD.Where its specific gravity is measured
考题
According to the following statement， can you tell me which term is described？（） It is the air return for an air conditioned system. In most buildings， the area above a drop ceiling orunder a raised floor is used as the air return （source of air） for the air conditioning. Those drop ceiling and raised floors are also where wire is often installed. If wire and cable is installed in a dropceiling or raised floor， it is out of sight. If that cable were burning， it would give off toxic fumes.These would be fed to the rest of the building by the air conditioner. As a result， people could beinjured even though they are a long way from the fire.A、DAS areaB、plenum areaC、extended areaD、RF special area
考题
A technician is tasked with clearing all dust covering the fan vents of servers in a small office.Which of the following tools would be the BEST option?（）A、Small vacuumB、Air compressorC、Compressed air canD、Paint brush
考题
单选题Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.A
possibleB
necessaryC
practicableD
impracticable
考题
单选题A flooded lifeboat on board a vessel would adversely affect the vessel’s stabbility by（）.A
increasing the righting momentB
decreasing the vessel's displacementC
increasing the reserve buoyancyD
shifting the CG(center of gravity) off center
考题
单选题When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）A
intake strokeB
compression strokeC
power strokeD
exhaust stroke
考题
单选题The term diesel engine scavenging means（）A
delivering more air into the cylinder than it would normally receive during an ordinary charging processB
forcing the products of combustion out of the cylinder with the fresh air chargeC
collecting the air charge at the cleanerD
combustion and expansion of hot gas
考题
单选题Combustible gas indicators operate by drawing an air sample into the instrument（）.A
over an electrically heated platinum filamentB
where it is mixed with nitrogenC
where it is ignited by a sparking deviceD
where its specific gravity is measured
考题
单选题A lot of trees ______ around here every year, and we can enjoy fresher air now.A
were plantedB
are plantedC
will plantD
are planting
考题
单选题Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?（）A
Cooling the air to a temperature just above dew pointB
Heating the air to a point at which moisture will boil off ,then re-cooling itC
Cooling the air to a point below dew point, then reheating itD
Heating the air and then cooling it to a point below dew point
考题
单选题A flooded leg on a lift boat would adversely affect the vessel’s stability underway by（）.A
increasing the righting momentB
decreasing the vessel's displacementC
increasing the reserve buoyancyD
shifting the CG (center of gravity) off center
考题
单选题The exhaust ports are located around the lower part of the cylinder liner, （）the products of combustion are driven by scavenging air.A
in whichB
by whichC
through whichD
from which
热门标签
最新试卷