Unverified60% confidenceFactTime unknown
Presta气嘴顶部螺母充气前必须手动拧松才能进气，充气后需拧紧防止慢漏，不熟悉的新手常因忘记此步骤误以为气嘴损坏
2
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60%
Confidence
Long-term
Relevance
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