Aiming at the specialty,complexity and suddenness of the construction projects,the paper from the project bidding period,the construction contract period and the project settlement period illustrates how to undertake the project costs control,points out the relative measures of the project costs control,in order to make the costs management level of the construction enterprises step further.

Study on a predator-prey system with stage structure and Holling s type Ⅱ functional response;

Analyses of complexities in a single-species discrete model with stage structure and birth pulses;

Asymptotic behavior of solutions for a class of predator-prey system with stage structure;

Global asymptotical stability of a predator-prey system with stage-structure for prey;

Dynamic Behaviors of Impulsive Spraying Pesticide on a Population Model with Stage-structured and Birth Pulse;

A fishing dynamic system in an inshore-offshore area with stage-structure;