The main nitrogen-containing pollutant in the atmosphere is NOx, and two-thirds of the anthropogenic sources are from ____（）
A. Emission of coal combustion from power plants
B. Emission from mobile sources such as automobiles
C. Fuel combustion in industrial production process
D. Incineration process of waste incineration plants
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Among the following methods, the methods that can be used to extract different forms of heavy metals in soil include（）
A. SPE solid phase extraction
BCR fractional extraction
C. Tessier continuous extraction method
D. ASE accelerated solvent extraction
The source apportionment model of atmosphere which can infer the proportion of different source types is（）
A. Enrichment factor method
B. Chemical element balance method
C. Pollution load model
D. Environmental fluid dynamics model
The pE value of natural water with the decrease of pH（）
A. Decrease
B. Increase
C. Decrease first and then increase
D. Keep stable
What characteristics of soil lead to the non-linearity of pollution process and the decrease ofbioavailability of pollutants（）
A. Severe human disturbance
B. Affected by atmosphere and hydrosphere
C. Highly heterogeneous medium
D. No significant change with time
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