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BT-12904-M20-6(铜变径/真空压力表接头/M20*1.5-6)
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BG-C184801C(砂板闪式层析柱/内径73mm/壁厚3.5mm/长203mm)
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BG-P13004(标本缸/小展缸/样本瓶/直径90mm/高度120mm)
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BG-S401922(空心玻璃塞/玻璃空心塞/磨口19/22)
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