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为什么 ISO224BDWV 包装 Tape & Reel 和 Tube 的Device Marking不一样

如上面的图片所示: ISO224BDWVR 卷袋的丝印为:XISO224B,而管装的丝印为:ISO224B. 查技术参数丝印应该全部一致为:ISO224B。 卷袋的丝印中X代表什么意思?也差不到具体的解释。