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The crystal structure will be destroyed when the isomorphous substitution occurs.

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The external surface area of phyllosilicate clay minerals is definitely larger than its internal surface area.

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The Interlayer bonding force of kaolinite is stronger than that of montmorillonite.

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The availability of calcium is highest in which of the following condition?

A. The cation exchange capacity is 24 cmol(+)/Kg, while the exchangeable calcium is 12 cmol(+)/Kg
B. The cation exchange capacity is 30 cmol(+)/Kg, while the exchangeable calcium is 8 cmol(+)/Kg
C. The cation exchange capacity is 8 cmol(+)/Kg, while the exchangeable calcium is 5 cmol(+)/Kg
D. The cation exchange capacity is 15 cmol(+)/Kg, while the exchangeable calcium is 6 cmol(+)/Kg

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The four most abundant elements in soil are ( ).

A. O, Si, Al, Fe
B. K, Na, Ca, Mg
C. O, Al, K, Na
D. Si, Al, Ca, Mg

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