题目内容

Soil mineral is the main component of soil, and it accounts for ( ) of the total solid weight.

A. above 95%
B. above 80%
C. 85%
D. 75%

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The average carbon content of humic substances is ( ).

A. 45％
B. 38%
C. 58％
D. 65％

Which of the following does not belong to transported parent material?

A. Slope deposits
B. Residual deposits
C. Alluvial deposits
D. Colluvial deposits

Which of the following is not base cations?

A. H+
B. NH4+
Ca2+
D. K+

______ is a young soil developed from sandy parent material in arid and semi-arid regions.