Unverified85% confidenceDecision RuleTime unknown
调弦稳定性看弦钮类型：封闭式铜制齿轮弦钮（1:14及以上传动比）比开放式塑料弦钮走音慢，儿童琴优先选封闭式齿轮弦钮，能减少每天反复调音的挫败感
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