[KongchangAI]
Unverified83% confidenceFactTime unknown

中国儿童自行车3C标准(GB 14746)要求:链条防护装置需完全遮盖链条与链轮咬合部位,可动部件间隙需避免夹伤手指(≤5mm或≥12mm)

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83%
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