Recently, the Ministry of Public Security of the PRC announces that the rate of solved criminal cases in 2003 can only reach 30%, so it is obvious that we have fallen behind when compared with many advanced countries.

According to the low rock breaking efficiency,short service time and other disadvantages of the rolling cuter in the hard rock drilling of the mine shaft rising boring,a new pick shape tooth rolling cuter was developed.

They affect directly the crushing efficiency,productivity and energy consumption of the crusher.

Moreover,the crushing efficiency is increased,granularity is ameliorated,energy saving and consumption reduction is obtained through improve crusher cavity design,increase total safety pressure and crushing cone.

Based on the roadway section and the constructing condition,the test of roadway excavation through hard rock improves the technology of blasting by stages in straight hole gate excavation,and centralizing on the effect of gate excavation,optimizes the related working procedure;not only boosts the blasting efficiency and cycle advance,but also reduces the consumption of materials and supplies.

Through application of this technique in tunneling of hard rock, the blasting efficiency is improved.

The blasting efficiency of rock roadway construction was raised.

The paper establishes a model on how to evaluate the scheme to improve children s studying efficiency which has been planned the by the educators (the scheme is called briefly efficiency scheme in the following),and how to get the best efficiency scheme with the excellent ability of operation.