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单选题
The Earth’s irregular heating is caused by （）.
A
the time of day
B
the seasons
C
geography
D
All of the above
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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
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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
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单选题Advection fog is most commonly caused by（）.A
air being warmed above the dew pointB
saturation of cold air by rainC
a rapid cooling of the air near the surface of the Earth at nightD
warm moist air being blown over a colder surface
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单选题The scientists are not sure_______.A
how long the ice age lastedB
where ice sheets melted during the ice ageC
what caused the temperature changesD
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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
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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
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单选题Air circulation is caused or affected by（）.A
the rotation of the earth on its axisB
convection currents caused by differences in radiant heating between equatorial and polar regionsC
mountain rangesD
All of the above
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单选题According to the passage, _____.A
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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
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单选题Permanent magnetism is caused by（）.A
operation of electrical equipment and generators on board shipB
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the vertical component of the earth's magnetic field acting on the vertical soft iron
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refraction of light as it enters the Earth's atmosphereB
rotation of the Earth on it's axisC
the body's orbital motion during the time required for its light to reach EarthD
a false horizon
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单选题The transition of the Earth’s magnetic field is possibly caused by _____.A
the flows of melted iron inside the EarthB
the periodical movement of the EarthC
the mechanical energy of the solar systemD
the force coming from outer space
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