女优色图,日韩不卡小黄片,蜜桃人妻,亚洲欧美一区二区精品

Supelclean™ ENVI-Carb™ 固相萃取散裝填料 pkg of 50 g

TLC硅膠60 pkg of 25 sheets, sheet L × W 20 cm × 20 cm, aluminum support

Chromolith® RP-18封端 L × I.D. 25 mm x 3 mm HPLC column

Supel™ QuE Citrate Extraction Tube, pk of 50, suitable for EN 15662 別名: QuEChERS

緊密的反應(yīng)器螺旋管 L × I.D. 5 m × 0.5 mm, volume 1.0 mL

SPME固相微萃取萃取頭 Carboxen/聚二甲基硅氧烷 (CAR/PDMS) df 75 μm(CAR/PDMS, for use with manual holder, needle size 24 ga