扩晶环4寸、6寸扩晶环6寸美国进口扩晶环品牌：Perfection编号内圈In外圈In厚度In产地ABCDWR-30-144.5304.7684.7624.9900.236美国WR-40-145.5205.7505.7445.9810.236美国WR-50-146.6897.0107.0007.3220.236美国WR-60-147.6707.9737.9758.2800.236美国WR-80-148.8569.1769.1789.4980.236美国)