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
The points on the earth’s surface where the magnetic dip is 90° are（）.
A
Along the magnetic equator
B
Connected by the isoclinal line
C
The isopors
D
The magnetic poles
参考答案
参考解析
解析：
暂无解析
更多 “单选题The points on the earth’s surface where the magnetic dip is 90° are（）.A Along the magnetic equatorB Connected by the isoclinal lineC The isoporsD The magnetic poles” 相关考题
考题
____ is covered with heavy snow.
A.The earth's surfaceB.The surface of earthC.The surface earthD.The earth surface
考题
The agonic line on an isomagnetic chart indicates the ______.A.magnetic equatorB.magnetic longitude reference lineC.points where there is no variationD.points where there is no annual change in variation
考题
Isogonic lines are lines on a chart indicating ______.A.points of equal variationB.points of zero variationC.the magnetic latitudeD.magnetic dip
考题
Permanent magnetism is caused by ______.A.operation of electrical equipment and generators on board shipB.the earth's magnetic field affecting the ship's hard iron during constructionC.the horizontal component of the earth's magnetic field acting on the horizontal soft ironD.the vertical component of the earth's magnetic field acting on the vertical soft iron
考题
Compass deviation is caused by ______.A.magnetism from the earth’s magnetic fieldB.misalignment of the compassC.magnetism within the vesselD.a dirty compass housing
考题
Deviation in a compass is caused by the ______.A.vessel’s geographic positionB.vessel’s headingC.earth’s magnetic fieldD.influence of the magnetic materials of the vessel
考题
If a magnetic compass is not affected by any magnetic field other than the Earth’s which statement is TRUE?______.A.Compass error and variation are equalB.Compass north will be true northC.Variation will equal deviationD.There will be no compass error
考题
Magnetic dip is a measurement of the angle between the ______.A.geographic pole and the magnetic poleB.lubber’s line and true northC.horizontal and the magnetic line of forceD.compass heading and the magnetic heading
考题
共用题干
Where Did the Earth's Water Come From?Earth is located within the"snow line"of the solar system,the region closest to the Sun where H2 0 is primarily in liquid or gaseous form,if at all.______(46)The snow line phenomena is reflected in the water content of planets like Mercury,Venus,and Mars. Water is absent on Mercury.On Venus,H2O only exists as a trace element in the atmosphere.Mars only has a thin veneer of ice in its polar regions.In general,water is rare within the snow line.Why does Earth have so much water relative to the other inner planets?71%of the surface is covered in the oceans,more than half of which is deeper than 3,000 meters,with an approximate total volume of 1.3 billion cu km.______(47)There are various theories as to where all the Earth's water came from,but several theories have fared better than the others.______(48)When the Earth was in the process of forming,with a radius just 40%smaller than at present,it would have had enough gravity to hold on to a tenuous atmosphere with water vapor. The first water vapor on the planet would have come from the planet's internals,where volatile(low weight)chemicals would have a tendency to float to the top,and heavy chemicals(iron and nickel)would sink.Though the first of Earth's water came about through volcanism,this alone probably didn't produce enough to form stable pools on the surface.______(49)Comparing the isotope ratios of water on Earth and water from comets and asteroids has revealed that the majority of the Earth's water comes from asteroids.Throughout its history,Earth's water has increased in volume due to biological processes. In the early seas of Earth,hydrogen sulfide would have been in great supply,which,when reacted with carbon dioxide from the atmosphere during photosynthesis in sulfide-reducing bacteria,would have produced hydrogen,sulfur,and water.______(50)________（49）A: More water was added to the planet during several hypothesized large impacts from asteroids from the outer asteroid belt.B:We know that the oceans existed as early as 100 million years after the formation of the Earth.C:Still,the oceans only make up 0.023%of the Earth's total mass.D:Astronomers say Earth s water may have come from space.E:The snow line is located in the outerasteroid belt,between the orbits of Mars and Jupiter. F: Many geologists believe that the majority of Earth's water generated through this process.
考题
单选题Deviation is caused by（）.A
changes in the earth's magnetic fieldB
nearby magnetic land masses or mineral depositsC
magnetic influence inherent to that particular vesselD
the magnetic lines of force not coinciding with the lines of longitude
考题
单选题Compass deviation is caused by（）.A
magnetism from the earth's magnetic fieldB
misalignment of the compassC
magnetism within the vesselD
a dirty compass housing
考题
单选题The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.A
north magnetic poleB
south magnetic poleC
magnetic prime vertical meridianD
magnetic equator
考题
单选题Which statement about the Flinders bar of the magnetic compass is CORRECT（）.A
It compensates for the error caused by the vertical component of the Earth's magnetic fieldB
It compensates for error caused by the heeling of a vesselC
It compensates for quadrantal deviationD
It is only needed in equatorial waters
考题
单选题If a magnetic compass is not affected by any magnetic field other than the Earth’s，which statement is TRUE? （）A
Compass error and variation are equalB
Compass north will be true northC
Variation will equal deviationD
There will be no compass error
考题
单选题Geological evidence suggests that the earth’s magnetic polarity has switched back and forth many times over the millennia; such ______in the magnetic field may affect the ability of our planet to ward off cosmic radiation.A
intensificationsB
justificationsC
recordsD
correlationsE
fluctuations
考题
单选题A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）A
Great circleB
EquatorC
Small circleD
Meridian
考题
单选题During the transition of the Earth’s magnetic field _____.A
the compass will become uselessB
man and animals will be confused as to directionsC
the magnetic strength of the Earth will disappearD
the magnetic strength of the Earth will be stronger
考题
单选题Magnetic dip is a measurement of the angle between the（）.A
geographic pole and the magnetic poleB
lubber's line and true northC
horizontal and the magnetic line of forceD
compass heading and the magnetic heading
考题
单选题Variation in a compass is caused by（）.A
worn gears in the compass housingB
magnetism from the earth's magnetic fieldC
magnetism within the vesselD
lack of oil in the compass bearings
考题
单选题According to the passage, _____.A
we should not worry about the transition of the Earth’s magnetic fieldB
the Earth’s magnetic field will not change for at least 2000 yearsC
the Earth’s magnetic field has decreased its strength rapidlyD
the transition of the Earth’s magnetic field can be controlled by modern science
考题
单选题Without the sun’s light _____ the earth’s surface, it would be so cold that life could not exist on the earth.A
warmsB
warmedC
warmingD
to warm
考题
单选题What is an advantage of the magnetic compass aboard vessels?（）A
Compass error is negligible at or near the earth's magnetic polesB
It does not have to be checked as oftenC
It is reliable due to it's essential simplicityD
All points on the compass rose are readily visible
考题
单选题What is the basic principle of the magnetic compass（）.A
Magnetic materials of the same polarity repel each other and those of opposite polarity attractB
The Earth's magnetic lines of force are parallel to the surface of the EarthC
Magnetic meridians connect points of equal magnetic variationD
The compass needle（s）will，when properly compensated，lie parallel to the isogonic lines of the Earth
考题
单选题_____ most of the earth's surface is covered by water, fresh water is very rare and precious.A
AsB
OnceC
IfD
Although
考题
单选题The line which connects the points of zero magnetic dip is（）.A
An agonic lineB
The magnetic equatorC
A magnetic meridianD
All of the above
考题
单选题Permanent magnetism is caused by（）.A
operation of electrical equipment and generators on board shipB
the earth's magnetic field affecting the ship's hard iron during constructionC
the horizontal component of the earth's magnetic field acting on the horizontal soft ironD
the vertical component of the earth's magnetic field acting on the vertical soft iron
考题
单选题A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.A
hammering and jarringB
vibration and poundingC
varying magnetic fieldsD
stable or permanent magnetism of the ship
热门标签
最新试卷