Data can be generally divided into analog data and digital data.
举一反三
- Which is the modulation and demodulation technology mainly used among the following communication modes? A: Analog channel transmits digital data B: Analog channel transmit analog data C: Digital channel transmit digital data D: Digital channel transmit analog data
- Big data can be used to process verycomplex data.
- The data collected by the statistical survey can be original data or secondary data. The relationship between the original data and secondary data is ( ) A: The original data comes from the grass-roots units, and the secondary data comes from the superior units B: Secondary data is processed from original data C: There is no necessary connection between the original data and the secondary data D: There is no difference between primary data and secondary data
- Primary data is generally available more quickly and at a lower cost than secondary data.
- Dissertations can be solely based on secondary data without the need<br/>for primary data.() A: √ B: ×