高考数学立体几何试题汇编大题学生

We will continue to improve the companys internal control system, and steady improvement in ability to manage and control, optimize business processes, to ensure smooth processes, responsibilities in place; to further strengthen internal controls, play a control post independent oversight role of evaluation complying with third-party responsibility; to actively make use of internal audit tools detect potential management, streamline, standardize related transactions, strengthening operations in accordance with law. Deepening the information management to ensure full communication zero resistance. To constantly perfect ERP, and BFS+, and PI, and MIS, and SCM, information system based construction, full integration information system, achieved information resources shared; to expand Portal system application of breadth and depth, play information system on enterprise of Assistant role; to perfect daily run maintenance operation of records, promote problem reasons analysis and system handover; to strengthening BFS+, and ERP, and SCM, technology application of training, improve employees application information system of capacity and level. Humanistic care to ensure zero. To strengthening Humanities care, continues to foster company wind clear, and gas are, and heart Shun of culture atmosphere; strengthening love helped trapped, care difficult employees; carried out style activities, rich employees life; strengthening health and labour protection, organization career health medical, control career against; continues to implementation psychological warning prevention system, training employees health of character, and stable of mood and enterprising of attitude, created friendly fraternity of Humanities environment. To strengthen risk management, ensure that the business of zero risk. To strengthened business plans management, will business business plans cover to all level, ensure the business can control in control; to close concern financial, and coal electric linkage, and energy-saving scheduling, national policy trends, strengthening track, active should; to implementation State-owned assets method, further specification business financial management; to perfect risk tube control system, achieved risk recognition, and measure, and assessment, and report, and control feedback of closed ring management, improve risk prevention capacity. To further standardize trading, and strive to achieve according to law, standardize and fair. Innovation of performance management, to ensure that potential employees zero fly. To strengthen performance management, process control, enhance employee evaluation and levels of effective communication to improve performance management. To further quantify and refine employee standards . Work, full play party, and branch, and members in five type Enterprise construction in the of core role, and fighting fortress role and pioneer model role; to continues to strengthening four good leadership construction高考数学立体几何试题汇编解答题27（全国理19题）四棱锥SABCD中，底面ABCD为平行四边形，侧面SBC底面ABCD。已知ABC45，AB2，BC=2，SASB。()证明：SABC；()求直线SD与平面SAB所成角的大小；28（全国理19题）如图，在四棱锥S-ABCD中，底面ABCD为正方形，侧棱SD底面ABCD，E、F分别是AB、SC的中点。ABCDPEF第38题图第39题图()求证：EF平面SAD；()设SD = 2CD，求二面角AEFD的大小；29（北京理16题）如图，在中，斜边可以通过以直线为轴旋转得到，且二面角是直二面角动点的斜边上（I）求证：平面平面；（II）当为的中点时，求异面直线与所成角的大小；（III）求与平面所成角的最大值31（福建理18题）如图，正三棱柱ABCA1B1C1的所有棱长都为2，D为CC1中点。（）求证：AB1面A1BD；（）求二面角AA1DB的大小；（）求点C到平面A1BD的距离；ABCDOFAEBGDFCAEBCFDG1G2图1图234（湖南理18题）如图1，分别是矩形的边的中点，是上的一点，将，分别沿翻折成，并连结，使得平面平面，且连结，如图2（I）证明：平面平面；（II）当，时，求直线和平面所成的角；36（江西理20题）右图是一个直三棱柱（以A1B1C1为底面）被一平面所截得到的几何体，截面为ABC已知A1B1B1C1l，AlBlC190，AAl4，BBl2，CCl3。（I）设点O是AB的中点，证明：OC平面A1B1C1；（II）求二面角BACA1的大小；（）求此几何体的体积；38（宁夏理19题）如图，在三棱锥中，侧面与侧面均为等边三角形，为中点（）证明：平面；（）求二面角的余弦值39（陕西理19题）如图,在底面为直角梯形的四棱锥中，,BC=6。()求证：；()求二面角的大小；41（四川理19题）如图，四边形是直角梯形，90，1，2，又1，120，直线与直线所成的角为60.（）求证：平面平面；（）求二面角的大小；（）求三棱锥的体积；42（天津理19题）如图，在四棱锥中，底面，是的中点（）证明；（）证明平面；（）求二面角的大小；43（浙江理19题）在如图所示的几何体中，平面ABC，平面ABC，M是AB的中点。（）求证：；（）求CM与平面CDE所成的角；清正廉洁是为政之本。在市政管理建设中，我要牢固树立廉洁勤政信念，坚持遵守纪律不打折扣、执行政策不走样子，反腐倡廉不搞形式。大力推行政务公开，对群众关心play levels cadres in enterprise development in the of backbone backbone role; to full strengthening members youth work, full play youth employees in company development in the of force role; to improve independent Commission against corruption work level, strengthening on enterprise business key link of effectiveness monitored. , And maintain stability. To further strengthen publicity and education, improve the overall legal system. We must strengthen safety management, establish and improve the education, supervision, and evaluation as one of the traffic safety management mechanism. To conscientiously sum up the Olympic security controls, promoting integrated management to a higher level, higher standards, a higher level of development. Employees, today is lunar calendar on December 24, the ox Bell is about to ring, at this time of year, we clearly feel the pulse of the XX power generation company to flourish, to more clearly hear XX power generation companies mature and symmetry breathing. Recalling past one another across a railing, we are enthusiastic and full of confidence. Future development opportunities, we more exciting fight more spirited. Employees, let us together across 2013 full of challe