In this paper, a comprehensiye review of the history, elementary ideas and main results of the studies on stability problem, exit problem,bifurcation behavior and dynamical theory of nonlinear stochastic system is presented.

Mathematics teaching by using mathematical situations and problem posing in high schools and primary schools is an opening mathematics teaching because its teaching theory,teaching model,teaching method and learning method are open.

In the recent twenty years,much progress with problem posing has been made in the U.

At present there exist prominent problems such as teachers’improper behavior in the academic field, activities against laws or regulations, and unhealthy life styles, therefore, it is necessary to set up a good campus environment and opinion atmosphere for developi.

The author has reviewed the prominent problems and its consequences in "One Informing and Three Prevention" safety management in mining enterprises especially in small ones,and also pointed out the countermeasures,which is of guiding significance for mine safety management.

Teach the students the skill to discover problem and raise questions;

To raise questions properly is more important for philosophy than for science, and that s the special characteristic of philosophy.

All the single-key-lock-pair access control scheme are threaten by overflow problem.