index of state的用法和样例：
- By using linear matrix inequality (LMI) approach,a good region is presented fo r the upper bound index of state variance which is consistent with the prespecif ied pole region.
- Most republic have president as head of state.
- The head of state was deposed by the army.
- A person's face is often an index of his mood.
- The premier deals with important affairs of state.
- The President cannot rudely ignore a head of state.