植物沥青生产建设项目可行性研究报告.doc
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1、2008-2009学年度六年级第一学期 Class_ Name_ NO._ Mark_ Read and choose the answers阅读短文,选择正确的答案,并将其字母符号填在句子前面的括号里1、 Our country is very big. The weather in the north is different from the south. The weather in the east is different from the west. In Heilongjiang, its very cold in winter. In Hainan, its warm in
2、winter. We have many rainy days in the east of our country. But, it seldom rains in the west of our country.If you want to take a trip you must pay attention to (注意) the weather report.( )1. The weather in the north and the south are _.A. the same B. different( ) 2. Its _ in Hainan in winter. A. col
3、d B. warm( ) 3. It often rains in the _ of our countryA. east B. west( ) 4. We should _ before we take a trip.A. watch the weather report B. watch VCD( ) 5. The underlined word “seldom” means _. (下划线词“seldom”在这里的意思是什么?)A. 常常 B. 很少2、Hi, I am Susan. I am from the U.K. But now Im studying in China. Im
4、going to do many things in the winter holiday. First, Im going to finish my homework. Then Im going to take a trip. Im going to Beijing, which is the capital of China. Its snowy in Beijing. There is snow everywhere. So Im going to make a snowman. I can ski. My parents will come to China and go with
5、me. We are going to fly there. We are going to have a nice trip.( )1. Susan is from_. A. China B. England ( )2. Now Susan is in_. A. China B. England( )3. Beijing is the capital of _.A. China B. U.K.( )4. Susan is going to _ in Beijing. A. skate B. play with the snow. ( )5. They are going to go to B
6、eijing_.A. by plane B. by train3、 My parents work in a shoe factory. They get up at 5:30. They first cook breakfast. Then they go to work by bus. They work there from 8:00am to 5:00pm. They come home at about 6:00pm and cook supper for us in the evening. Mother washes clothes in the evening. Father
7、often makes toys for us in the evening. They are busy all day. But they like their jobs very much and the boss likes them too.( ) 1. Father gets up at_. A. 5:30 B. 6:00( ) 2.My parents are _. A. teachers B. workers( ) 3. Do my parents work in the factory the evening?A. Yes, they do. B. No, they dont
8、.( ) 4. My parents work for _ hours every day.A.10 B. 9( ) 5. My parents are _ workers. A. good B. bad4、Tom and John are good friends. Tom is 15 years old, two years older than John. John is 156 cm tall and Tom is 169cm. John is 40kg and Tom is 59 kg. They usually go to school and go home together.
9、It is fun to see they walk together every day.( ) 1. John is _ years old. A. 13 B. 15( ) 2. John is _ than Tom. A. taller B. shorter( ) 3. Tom is 19kg _ than John. A. heavier B. thinner( ) 4. Tom and John usually go to school and go home _. A. on foot B. by bike( ) 5. They feel _ on the way. A. happ
10、y B. bored 5、 During the summer holiday, my grandparents went to China. First they flew to Beijing from London. Then they went to Guangzhou by train. When they went to my home, I wanted to help my grandpa carry his heavy bag, but he did it by himself. They bought many presents for us. I got a dress.
11、 My brother got a toy plane. They took many dried fruits for us, they grew(种植) them by themselves. My grandparents are farmers. They are hard-working people.( ) 1. Where are my grandparents from? A. Beijing. B. London.( ) 2. How did my grandparents go to China? A. By plane. B. By train.( ) 3. What w
12、as the present to me?A. A dress. B. A toy plane.( ) 4. I _ my grandparents carry his bag. A. helped B. didnt help( ) 5. My grandma i习题课直线、平面平行与垂直【课时目标】1能熟练应用直线、平面平行与垂直的判定及性质进行有关的证明2进一步体会化归思想在证明中的应用a、b、c表示直线,、表示平面位置关系判定定理(符号语言)性质定理(符号语言)直线与平面平行ab且_aa,_ab平面与平面平行a,b,且_,_ab直线与平面垂直la,lb,且_la,b_平面与平面垂直,a,
13、_b一、选择题1不同直线M、n和不同平面、给出下列命题:M; n;M,n异面; M其中假命题的个数为()A0 B1 C2 D32下列命题中:(1)平行于同一直线的两个平面平行;(2)平行于同一平面的两个平面平行;(3)垂直于同一直线的两直线平行;(4)垂直于同一平面的两直线平行其中正确命题的个数有()A4 B1 C2 D33若a、b表示直线,表示平面,下列命题中正确的个数为()a,bab;a,abb;a,abbA1 B2 C3 D04过平面外一点P:存在无数条直线与平面平行;存在无数条直线与平面垂直;有且只有一条直线与平面平行;有且只有一条直线与平面垂直,其中真命题的个数是()A1 B2 C3
14、 D45如图所示,正方体ABCDA1B1C1D1中,点P在侧面BCC1B1及其边界上运动,并且总是保持APBD1,则动点P的轨迹是()A线段B1CB线段BC1CBB1的中点与CC1的中点连成的线段DBC的中点与B1C1的中点连成的线段6已知三条相交于一点的线段PA、PB、PC两两垂直,点P在平面ABC外,PH面ABC于H,则垂足H是ABC的()A外心 B内心 C垂心 D重心二、填空题7三棱锥DABC的三个侧面分别与底面全等,且ABAC,BC2,则二面角ABCD的大小为_8如果一条直线与一个平面垂直,那么,称此直线与平面构成一个“正交线面对”,在一个正方体中,由两个顶点确定的直线与含有四个顶点的
15、平面构成的“正交线面对”的个数是_9如图所示,在正方体ABCDA1B1C1D1中,P为BD1的中点,则PAC在该正方体各个面上的射影可能是_(填序号)三、解答题10如图所示,ABC为正三角形,EC平面ABC,BDCE,且CECA2BD,M是EA的中点,求证:(1)DEDA;(2)平面BDM平面ECA;(3)平面DEA平面ECA11如图,棱柱ABCA1B1C1的侧面BCC1B1是菱形,B1CA1B(1)证明:平面AB1C平面A1BC1;(2)设D是A1C1上的点且A1B平面B1CD,求的值能力提升12四棱锥PABCD的顶点P在底面ABCD中的投影恰好是A,其三视图如图:(1)根据图中的信息,在四
16、棱锥PABCD的侧面、底面和棱中,请把符合要求的结论填写在空格处(每空只要求填一种):一对互相垂直的异面直线_;一对互相垂直的平面_;一对互相垂直的直线和平面_;(2)四棱锥PABCD的表面积为_13如图,在多面体ABCDEF中,四边形ABCD是正方形,AB2EF2,EFAB,EFFB,BFC90,BFFC,H为BC的中点(1)求证:FH平面EDB;(2)求证:AC平面EDB;(3)求四面体BDEF的体积转化思想是证明线面平行与垂直的主要思路,其关系为即利用线线平行(垂直),证明线面平行(垂直)或证明面面平行(垂直);反过来,又利用面面平行(垂直),证明线面平行(垂直)或证明线线平行(垂直),
17、甚至平行与垂直之间的转化这样,来来往往,就如同运用“四渡赤水”的战略战术,达到了出奇制胜的目的习题课直线、平面平行与垂直 答案知识梳理a,ba,ba,b,abPa,ba,b,abPababa,b作业设计1D命题正确,面面平行的性质;命题不正确,也可能n;命题不正确,如果m、n有一条是、的交线,则m、n共面;命题不正确,m与的关系不确定2C(2)和(4)对3A正确4B正确5A连接AC,AB1,B1C,BDAC,ACDD1,BDDD1D,AC面BDD1,ACBD1,同理可证BD1B1C,BD1面AB1CPB1C时,始终APBD1,选A6C如图所示,由已知可得PA面PBC,PABC,又PHBC,BC
18、面APH,BCAH同理证得CHAB,H为垂心790解析由题意画出图形,数据如图,取BC的中点E,连接AE、DE,易知AED为二面角ABCD的平面角可求得AEDE,由此得AE2DE2AD2故AED90836解析正方体的一条棱长对应着2个“正交线面对”,12条棱长共对应着24个“正交线面对”;正方体的一条面对角线对应着1个“正交线面对”,12条面对角线对应着12个“正交线面对”,共有36个910证明(1)如图所示,取EC的中点F,连接DF,EC平面ABC,ECBC,又由已知得DFBC,DFEC在RtEFD和RtDBA中,EFECBD,FDBCAB,RtEFDRtDBA,故EDDA(2)取CA的中点
19、N,连接MN、BN,则MN綊EC,MNBD,N在平面BDM内,EC平面ABC,ECBN又CABN,BN平面ECA,BN平面MNBD,平面MNBD平面ECA即平面BDM平面ECA(3)BD綊EC,MN綊EC,BD綊MN,MNBD为平行四边形,DMBN,BN平面ECA,DM平面ECA,又DM平面DEA,平面DEA平面ECA11(1)证明因为侧面BCC1B1是菱形,所以B1CBC1又B1CA1B,且A1BBC1B,所以B1C平面A1BC1又B1C平面AB1C,所以平面AB1C平面A1BC1(2)解设BC1交B1C于点E,连接DE,则DE是平面A1BC1与平面B1CD的交线因为A1B平面B1CD,所以
20、A1BDE又E是BC1的中点,所以D为A1C1的中点,即112(1)PABC(或PACD或ABPD)平面PAB平面ABCD(或平面PAD平面ABCD或平面PAB平面PAD或平面PCD平面PAD或平面PBC平面PAB)PA平面ABCD(或AB平面PAD或CD平面PAD或AD平面PAB或BC平面PAB)(2)2a2a2解析(2)依题意:正方形的面积是a2,SPABSPADa2又PBPDa,SPBCSPCDa2所以四棱锥PABCD的表面积是S2a2a213(1)证明如图,设AC与BD交于点G,则G为AC的中点连接EG,GH,由于H为BC的中点,故GH綊AB又EF綊AB,EF綊GH四边形EFHG为平行
21、四边形EGFH而EG平面EDB,FH平面EDB,FH平面EDB(2)证明由四边形ABCD为正方形,得ABBC又EFAB,EFBC而EFFB,EF平面BFCEFFHABFH又BFFC,H为BC的中点,FHBCFH平面ABCDFHAC又FHEG,ACEG又ACBD,EGBDG,AC平面EDB(3)解EFFB,BFC90BF平面CDEFBF为四面体BDEF的高又BCAB2,BFFCVBDEF1 书山有路勤为径,学海无涯苦作舟。2021组织人事工作总结3篇 一、上半年工作完成情况 (一)积极参与群众路线教育实践活动,提高政治理论水平。根据分局实践活动安排,参与研究制定活动实施方案和实施意见,并根据实施
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