[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

低年级儿童(6-8岁)初学写字建议用0.7mm或0.9mm笔芯,比0.5mm更抗断芯,减少因频繁断芯打断书写节奏;书写熟练后(9岁以上)再过渡到0.5mm以获得更精细的笔迹

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