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| 正面还是反面? | |
| 引用本文： | 刘世一.正面还是反面?[J].初中生学习,2003(9). |
| 作者姓名： | 刘世一 |
| 摘 要： | Place some coins on a table(as many as yon like),Turn yourback and ask a friend to turn overone coin at a time,saying“turn”whenever he does so.He can do itas often as he wants and turn over |
| 本文献已被 CNKI 等数据库收录！ | |