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单选题
As observed from the Earth，the angle between lines from the Earth to the Sun and the Earth to an inferior planet is known as（）.
A
elongation
B
conjunction
C
opposition
D
quadrature
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There are no__________ differences between the two products, despite the fact that each is made from different materials.A.observably
B.observing
C.observe
D.observable
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共用题干
The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades._________(46 ) But from high above,these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1,500 years old,but their purpose is still a mystery._________(47)However,it would probably be very tricky to land a spaceship in the middle ofpictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle(己 录）of the movement of the stars and planets._________(48)Later,an astronomer tested his theory with a computer,but he couldn't find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. _________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area._________（50)_________(46)A:Other scientists are now searching for evidence to prove this.B: A Swiss writer named Erich Von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.C:Scholars differ in interpreting the purpose of the designs.D:The largest pictures may have been the sites for special ceremonies.E:Seen from the ground,it looks like lines scratched into the earth.F: He called Nazca"the largest astronomy book in the world".
考题
The rising sun is especially beautiful to look at from this angle.A:particularly
B:obviously
C:apparently
D:expressively
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共用题干
Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.According to the passage,"weight"should be understood in the sense thatA:it is fixed if it is outside the earth's gravitational puliB:it decreases four times when it is 4,000 miles from the earth's centerC:it varies with the change of the gravitational attraction between two objectsD:things increase in amount as they are closer to the earth's surface
考题
共用题干
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共用题干
Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.The main idea of this passage isA:different weight systems in different placesB:freedom from traditional ideasC:traveling from the earth to the moonD:the effect of gravitation on weight
考题
若要在GZ表中，选出年龄在20至25岁的记录，则实现的SQL语句为（）ASELECT FROM GZ 年龄 BETWEEN 20，25BSELECT FROM GZ 年龄 BETWEEN 20 AND 25CSELECT #FROM GZ 年龄 BETWEEN 20 OR 25DSELECT *FROM GZ 年龄 BETWEEN 20 AND 25
考题
What does the command show | compare rollback 1 display?（）A、the difference between the current candidate configuration and the candidate configuration from one commit agoB、the difference etween the current active configuration and the active configuration from the one commit agoC、the difference between the current active configuration and the active configuration from one commit agoD、the difference between the current candidate configuration and the archived configuration from one commit ago
考题
What does the command show | compare rollback 1 display?（）A、the difference between the current candidate configuration and the candidate configuration from one commit agoB、the difference between the current active configuration and the current candidate configurationC、the difference between the current active configuration and the active configuration from one commit agoD、the difference between the current candidate configuration and the archived configuration from one commit ago
考题
单选题Vessels shall be deemed to be in sight of one another only when one（）from the other.A
can be observed visuallyB
can be observed by radarC
can be located on the radarD
can be heard
考题
单选题Outlets in gasoline fuel lines are（）.A
permitted for drawing fuel samplesB
permitted for draining fuel from linesC
permitted for bleeding air from linesD
prohibited
考题
单选题Opposition occurs when（）.A
the Sun，Earth，and Moon are at right anglesB
the Sun's declination is 0°and is moving southC
an inferior planet is at the maximum angle to the line of sight to the SunD
the Earth is between a planet and the Sun
考题
单选题Perihelion is the point where the Sun（）.A
is nearest to the EarthB
is farthest from the EarthC
is on the opposite side of the Earth from the MoonD
and Moon and Earth are in line
考题
单选题If two mooring lines are to be placed on the same bollard，which method is BEST?（）.A
Place the eye from the forward line on the bollard and then place the eye from the second line directly over the firstB
It makes no difference how the lines are placedC
Place the eye from either line on the bollard，and then bring the eye of the other line up through the eye of the first，and place it on the bollardD
Place both eyes on the bollard，in any manner，but lead both lines to the same winch head on the vessel and secure them on the winch
考题
单选题According to the passage, the root cause for weather changes on the earth is ______.A
the atmosphere surrounding the earthB
water from oceans and lakesC
energy from the sunD
greenhouse gases in the sky
考题
单选题The angle at the pole measured through 180°from the prime meridian to the meridian of a point is known as（）.A
the departureB
the polar arcC
longitudeD
Greenwich hour angle
考题
单选题从“商品”表中检索单价（数据类型为整数）大于等于60并且小于90的记录信息，正确的SQL命令是（ ）。A
SELECT * FROM 商品 WHERE 单价 BETWEEN 60 AND 89B
SELECT * FROM 商品 WHERE 单价 BETWEEN 60 TO 89C
SELECT * FROM 商品 WHERE 单价 BETWEEN 60 AND 90D
SELECT * FROM 商品 WHERE 单价 BETWEEN 60 TO 90
考题
单选题若要在GZ表中，选出年龄在20至25岁的记录，则实现的SQL语句为（）A
SELECT FROM GZ 年龄 BETWEEN 20，25B
SELECT FROM GZ 年龄 BETWEEN 20 AND 25C
SELECT #FROM GZ 年龄 BETWEEN 20 OR 25D
SELECT *FROM GZ 年龄 BETWEEN 20 AND 25
考题
单选题An axial轴向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned （）.A
radially from the shaftB
parallel to each other and to the shaftC
parallel to each other but at a right angle to the shaftD
at an angle to each other and to the shaft
考题
单选题We learn from the passage that ______.A
all living things on the earth depend on the sun for their foodB
a forest looks dark in winter because it absorbs solar energyC
only 0.023 of the energy from the sun is made use of on the earthD
greenhouse gases allow heat energy to escape from the earth’ s surface
考题
单选题Aphelion is the point where the Sun（）.A
and Moon and Earth form a right angleB
and Moon and Earth are in lineC
crosses the celestial equatorD
is farthest from the Earth
考题
单选题To develop maximum anchor holding power，the optimum angle between the anchor’s shank and the mooring lines is（）.A
0 degreesB
10 degreesC
20 degreesD
30 degrees
考题
单选题From the text we learn that the laser can ______.A
cut a structure from a right positionB
design parts of a complex structureC
measure the distance between planetsD
predict the movement of earth’s plates
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