What is the shortest wavelength present in the Brackett series of spectral lines? (  )

普朗克定律(Planck's distribution law)描述的是( ) A: 黑体发射力(Total, hemispherical blackbody emissive power) B: 黑体光谱半球发射力(Spectral, hemispherical blackbody emissive power) C: 黑体光谱定向发射力(Spectral, hemispherical blackbody emissive power) D: 光谱辐射强度(Spectral Intensity of the emitted radiation)

An energy difference of 4×10-3 eV for the 3p subshell of sodium accounts for the how many splitting of a spectral line at 589.3 nm is (  )

By using the methods of spectral analysis, astronomers ____ to learn a great deal about the sun.? is able;;|will be able;;|has been able;;|have been able

Through spectral analysis of Yangshao culture pigments, the most prominent element in the red pigment was _____. A: tin B: silicon C: copper D: iron

In atomic absorption spectroscopy, the molecular absorption of the atomizer belongs to： A: Interference caused by overlapping spectral lines B: Chemical interference C: Physical interference D: Background interference

Which<br/>of the following are supervised learning: () A: Logistic<br/>regression B: LASSO<br/>regression C: Support<br/>Vector Machine D: Spectral<br/>clustering

常用的传感器有：（）。 A: Multi Spectral Scanner（MSS） B: Thematic Mapper（TM） C: 多光谱摄影机 D: High Resolution Visible range instruments（HRV）扫描仪

How to access the cardiac function by using ultrasound:( ) A: M<br/>mode B: B<br/>mode C: Spectral<br/>Doppler pattern D: Tissue<br/>Doppler imaging E: All of the above

2.Image features are an important basis for image analysis and can be divided into two types: natural features and artificial features. Which of the followings are natural features( ) A: A. Temporal features B: B. Spectral features C: C. Edge features D: D. Geometric features