题目内容

Based on Student 1’s discussion and Fact 4, while matter flowed between Algol A and Algol

A. hydrogen nuclei to make helium nuclei at its center.
B. hydrogen nuclei to make helium nuclei in a shell surrounding its center.
C. helium nuclei to make hydrogen nuclei at its center.
D. helium nuclei to make hydrogen nuclei in a shell surrounding its center.

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A. schedule
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A. 2:3:6
B. 2:6:3
C. 3:1:2
D. 3:2:1
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