题目内容

Aluminum-oxygen octahedron consists of one aluminum ion and ( ) oxygen ions.

A. four
B. five
C. six
D. seven

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Iron oxides belong to ( ).

A. Inorganic colloids
B. Organic colloids
C. Organo-mineral colloids
D. None of the above

In soil science, particles that are less than ( ) microns in diameter are called soil colloids.

A. one
B. two
C. three
D. four

For Inorganic nitrogen, ______ and nitrate nitrogen can be absorbed by plant directly.

Mineral potassium is the main forms of soil K.