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https://www.researchgate.net/publication/232508016_The_effect_of_expanded_versus_massed_practice_on_the_retention_of_multiplication_facts_and_spelling_lists
您即将离开知乎,请注意您的帐号和财产安全。
https://www.researchgate.net/publication/232508016_The_effect_of_expanded_versus_massed_practice_on_the_retention_of_multiplication_facts_and_spelling_lists