Because the behaviour of mankind has been increasingly becoming the main geological strength which causes the changes of global system, the contemporary global changes evidently indicate the catastrophic characteristics and are paid more and more attention to by the international sciences and different countries.

The overall aim of the studies on the global system is to resolve the problems occurringon a global scale and to realize a coordinated and sustainable development between resources,environment and economy.

The simulation results indicate that the slot gating system is difficult to obtain the favorable filling sequence because of the excessive high of the casting,the liquid metal splashes badly during the mold-filling stage.

A study on the No-Gap nursing mode in wards;