[KongchangAI]
Unverified80% confidenceDecision RuleTime unknown

难度递进要检查是否'分级分册'而非'一本混装':优质产品按周或按阶段编排,前后难度阶梯明确;一本内难度跳跃过大的会让孩子中途放弃

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80%
Confidence
Long-term
Relevance
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