不要在这个区域使用太多溶剂。 A: Do not use too much solvent on the area. B: Do not dress the area with solvent. C: Do not employ too much solvent in the area. D: Do not flood the area with solvent.

Which of the following methods do not belong to solvent extraction? () A: Simultaneous distillation and extraction; B: Solvent assisted flavor evaporation; C: Solid phase microextraction; D: Direct solvent extraction

中国大学MOOC: 化学溶剂法Chemical solvent method（）

It washes the solvent __________ all the metal parts. A: from B: to C: off D: of

Instability to remain cash solvent is the primary cause of business failure for real estate developers.

Which of the following is correct for TLC using silica gel as absorbent? A: Higher the absorption activity of absorbent. larger k and smaller Rf B: Higher the absorption activity of absorbent. larger k and larger Rf C: Stronger the polarity of solvent. larger k and smaller Rf D: Weaker the polarity of solvent. larger k an d larger Rf

Which one is correct for description of TLC using silica gel as absorbent? A: Higher the absorption activity of absorbent. larger k and smaller Rf B: Higher the absorption activity of absorbent. larger k and larger Rf C: Stronger the polarity of solvent. larger k and smaller Rf D: Stronger the polarity of solvent. larger k and larger Rf

Which one is NOT the obtaining method for essential oils? A: Pressing B: Organic solvent extraction C: Hydrodistillation D: Hydrodiffusion

For high oil-bearing oilseeds, the cake obtained after oil pressing can be further extracted using solvent method to obtain more oil.

Which of the following is not the curing method of adhesive? A: Anaerobic environment B: Loss of solvent C: Pressure on substrate D: Cooling of hot melt