ChinaAutoRegs|GB/T 39971-2021英文版翻译/English/汽车轮胎湿路面相对抓着指数限值和等级
Thresholds and grading of relative wet grip index for motor vehicle tyres
GB/T 39971-2021英文版翻译/汽车轮胎湿路面相对抓着指数限值和等级
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ChinaAutoRegs|GB/T 39971-2021英文版翻译/English/汽车轮胎湿路面相对抓着指数限值和等级
Thresholds and grading of relative wet grip index for motor vehicle tyres