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When does a neutron from one atom collides wit
问题详情
When does a neutron from one atom collides with the nucleus of another atom, a chain reaction can occur.此题为多项选择题。请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：does--去掉does
考查从句。此句的when引导时间状语从句，时间状语从句中，when后应直接跟主语，does多余。故删掉。
