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

I separate the variable “age” in my dataset into different catalogue, i.e. 0-25 years old; 26-50 years old; 50 -75 years old. This process is a _______() A: Quantization B: Normalization C: Scaling D: Feature extraction

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

数据预处理包括（ ）。 A: 数据集成（Data Integration） B: 特征提取与选择（Feature Extraction and Selection） C: 数据标准化（Data Normalization） D: 数据分组与聚合 E: 数据变换（Data Transformation） F: 数据清洗（Data Cleaning）

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

A is a single text data point. The is the collection of all the documents. A: Feature; document B: Corpus; feature C: Document; feature D: Feature; document

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