In this paper,a new hybrid approach for primary design of low-thrust gravity-assist mission is proposed based on reference trajectory theory.

The application of physical prospecting method in primary design of building project;

In thispaper,the roles and functions of the Soviet Union from selecting the site of factory, geological surveyof plant area, experiment for pumping up water, ore experiment, coking plant experiment, initial designto the building of construction base during the preparation and primary design to the building of con-structi.

The article proves the rationality of the adjustment of scheme at the stage detail design compared with the scheme at the primary design stage from the concept of natural ecological protection,construction convenience and safety,and security,maintenance and reparation in operation process,in order to offer a reference for bridge design engineering.

The preliminary design of wood frame structure houses;

Research of vibration analysis model of SWATH during preliminary design;

Content and requirement of preliminary design for agricultural construction project;

Research on reform of teaching pattern of preliminary design;

From the initial design,the design department puts "ecology and environmental protection" in primacy,highlights people first and fully considers the requirements of human-culture environment and emphasizes on selection of route schemes by comparison,and insists on geological and environm.