Unverified86% confidenceSolutionTime unknown
选购原则组合：日常书写=0.5mm+HB+旋转出芯/摇摇；考试=1.3mm粗芯+2B；制图=0.3或0.5mm+固定金属导管+低重心金属杆
1
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86%
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Long-term
Relevance
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