There are various working patterns for an educational institution to implement its internal audit with the help of other social organizations,such as seeking for consultancy or assistance,project entrusting,participative project entrusting and contracted project entrusting.

Low-thrust trajectories using gravity-assist maneuvers can provide more transfer opportunities and excellent performance on interplanetary missions.

Study of “Ping/Pin Jie Li”——Annotation and translation of two sentences in Ci poetry of Lin Jiang Xian·Willow Catkin in Dream of the Red Chamber;