Which of the following does NOT fit the definition of the black hole? We learn from this passage that

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问题 Which of the following does NOT fit the definition of the black hole?
We learn from this passage that

选项 A、the sun is the heaviest star in the universe.
B、a star in the sky might have an invisible partner.
C、two black holes are dragged towards each other.
D、the mass of a star is equal to that of its companion.

答案B

解析

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Which of the following does NOT fit the definition of the black hole? We learn from this passage that

职称英语理工类B级

职称英语

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Whichofthefollowingareahasthehighestaveragepopulationdensity?Lowdensityofpopulationisgenerallyassociatedwith

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StomachUlcerStomachulcersarethecauseofseverepainformanypeople.Doctorshavebeenabletohelplessenthepainof

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