A.Gases have been heated to a temperature of multimillion-degree.B.Gases have been dra

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A.Gases have been heated to a temperature of multimillion-degree.

B.Gases have been drawn to the black hole at a very high speed.

C.Gases have been tearing apart by the black hole.

D.Gases have been sucked by the black hole.

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热搜:a是b的充分条件,b是a的必要条件吗