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二氯甲烷中23种多环芳氢类混标, 100 μg/ml
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IC 钾标准品,7447-40-7,Potassium Standard for IC,1000 mg/L K+ in water
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High-purity silicone stopper, size 10 (49D)
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High-purity silicone stopper, size 00 (15D)
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High-purity silicone stopper, size 15 (100D)
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High-purity silicone stopper, size 8 (41D)
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High-purity silicone stopper, size 000 (13D)
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High-purity silicone stopper, size 4 (27D)
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High-purity silicone stopper, size 11 (60D)
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High-purity silicone stopper, size 14 (92D)
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