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【单选题】
接触镜表面检查时，裂隙灯光源应照在待查镜片的（），因为镜片的沉淀物多附在此面。
A.
外曲面
B.
内曲面
C.
任一曲面
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【单选题】Passage Two 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 ...
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.
相关题目：
【单选题】Passage Two 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 ...
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.
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