ASTMF-21是什么标准
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ASTM F21 Standard Consumer Safety Specification For Recreational Powered Scooters And Pocket Bikes
休闲机动滑板车和便携式自行车的消费者安全规范
ASTM：美国材料与试验协会（American Society for Testing and Materials,ASTM）标准。
热心网友
ASTM F21 Standard Consumer Safety Specification For Recreational Powered Scooters And Pocket Bikes
休闲机动滑板车和便携式自行车的消费者安全规范
ASTM：美国材料与试验协会（American Society for Testing and Materials,ASTM）标准。
