题目

阅读理解 Head of Research Salary:￡55.271 We are looking for a Head of Research to manage the CWUResearch Department and Information Centre. You would be required to exercisecontrol of all research work of the department and manage a team of threeresearchers and four support staff. The person appointed would be expected to carry out researchwork of a strategic nature across the range of businesses in which the CWU hasor seeks membership and to contribute to the strategic thinking and directionof the union as a whole. You will need: proven line management skills, especially inmanaging and 如图，在四棱锥中，底面为菱形，为上一点.（1）若平面，试说明点的位置并证明的结论；（2）若为的中点，平面，且，求二面角的余弦值.