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【单选题】
人眼相当于一个口径为6mm的光学望远镜，它的极限星等是A.
0星等
B.
10星等
C.
3.5星等
D.
6.5星等
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A.
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B.
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C.
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D.
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A.
they meet
B.
in the front of
C.
at
D.
Friday afternoon
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A.
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B.
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C.
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D.
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