Which<br/>of the following techniques is not commonly used for taste compounds<br/>extraction? () A: Solvent extraction; B: Headspace extraction; C: Ultrafiltration; D: Ultrasonic technique

 extraction processing 

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

The extraction recovery is used to evaluate the extraction ability of the sample processing from the biosamples. The validation focuses on whether the analyte could be completely extracted.

The methods of multi-focus image extraction are as follows A: spatialdomain methods B: transform domain methods C: Binarization method D: Segmentation and extraction method

With scarcity, the price would equal only the ( ). A: marginal user cost B: marginal cost of extraction C: the sum of marginal extraction cost and marginal user cost. D: fixed costs

应用萃取（Extraction）命令也能建立选区。（）

For feature extraction, the effectiveness of an indexing scheme depends on the effectiveness of __________ in content presentation.

The primary sector includes agriculture, forestry and fishing, mining, and extraction of oil and gas.

Which of these are good techniques of extraction? A: Selection B: Pattern recognition C: Differencing D: Filters