1.

The formula for density index ID is ______

A. (e<sub>max</sub> e)
B. ( frac{(e_{max} e)}{(e_{min}-e)} )
C. ( frac{(e_{max} e_{min})}{(e_{max}-e)} )
D. ( frac{(e_{max} e)}{(e_{max}-e_{min})} )
Answer» E.


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