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举一反三
【单选题】There are some earth phenomena you can count on, but the magnetic field, some say, is not one of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years undergoes a dramatic...
A.
Polarity Reversal: A Fantastic Phenomenon of Nature.
B.
Measurement of the Earth’s Magnetic-Field Intensity.
C.
Formation of the Two Poles of the Earth.
D.
A New Approach to the Study of Geophysics.
【单选题】There are some earth phenomena you can count on, but the magnetic field, someday is not of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years undergo, dramatic polarity...
A.
decline
B.
intensify
C.
fluctuate
D.
reverse
【单选题】There are some earth phenomena you can count on, but the magnetic field, someday is not of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years undergo, dramatic polarity...
A.
Polarity Reversal; A Fantastic Phenomenon of Nature
B.
Measurement of the Earth"s Magnetic-Field Intensity
C.
Formation of the Two Poles of the Earth
D.
A New Approach to the Study of Geophysics
【单选题】第三篇 There are some earth phenomena you can count on, but the magnetic field, some say, is not one of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years un...
A.
decline
B.
intensify
C.
fluctuate
D.
reverse
【单选题】第三篇 There are some earth phenomena you can count on, but the magnetic field, some say, is not one of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years un...
A.
its identification of the origin of the earth’s magnetic field
B.
the way the earth’s magnetic intensity is measured
C.
its explanation of the shift in the earth’s polarity
D.
the way the earth’s fluctuation rhythm is defined