Available Fe, Mn, Physical sand, fine silt, clay, field capacity, urease and hydrogen peroxidase as main indexes were selected.

Points out the main indexes which should be mastered.

Based on the two years investigation and analysis, the authors carried out the opinion that the rhizine diameter of mulberry sapling could be used as the main index to judge the sapling quality.

The working group makes out the index factor system for agriculture information service at two levels based on the in-depth se.

In the design of the digital and logical circuits, the overall consideration from the simpliest circuits, demand of function and target, and reliablitly makes the circuits designed rational and reach high-class circuits to provide refrence for practical workers in order to make them fully understand and correctly grasp the design of the digital and logical circuits.

Firstly, the area circular error probability (ACEP), area vital index, area hitting probability and hitting vital index are defined as the concepts of coefficients for the optimal selection method.

In order to study the choosing method of aim points for cluster warhead shooting multi-area target,vital index of area,area hitting probability and hitting vital index were defined as the parameters of the choosing method.