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rapid development of the market economy environment to explore public servants duty consumption monetization reform has provided a good foundation. The socialization of rear service work has been launched, and rapid progress in some places and departments, duty consumption monetization of carrier and approach to management has been resolved. Third, in recent years, exploring the monetization of duty consumption has made some progress, have gained some experience and can provide reference to the comprehensive reform of the system of public servants duty consumption further. Implementing an honest canteen, standardize official entertaining management; enhancing the telecommunication expense management; elimination of County travel and countryside subsidies; research village officials capitalization management of corporate spending, and so on. Finally, group .18 session to be held in Beijing from November 9, 2013 to 12th. 35 years ago blew the third plenary session of the reform and opening up in the spring breeze, changed, affect the world; today, 35 years later, in the eyes of the nation and the world expect, again to reform mark China, ushered in the 18 session. XI General Secretary pointed out that Chinas reform has entered a crucial period and the Sham Shui Po District, must be based on greater political courage and wisdom, lose no time in deepening reform in important fields. Dares to crack a hard nut, dares to question the Rapids, which dares to break the barrier of ideas, and dare to benefit cure barriers. Deepening reform and opening up is on schedule to achieve institutional safeguards of the moderately well-off. Under the five in one the General layout of socialist modernization requirements, 18 session of the decision was a five in one and the improvement of overall scheme of reform, will promote an integrated and coordinated economic, political, cultural, social and ecological civilization construction of the five reforms and the partys construction in the area of institutional reform. The five in one programme is to achieve a comprehensive reform of institutional guarantees for objectives of build a well-off society, the smooth progress of the construction of a well-off society and reform the objectives of the programme. One, holding time and place importance on November 9, 2013 to the 18 session of the 12th Beijing since 1978, 35, have been 7 plenary session, each time on major issues of political and economic life of the country has made important deployment. In accordance with PRC political practice, often at every session of the CPC Central Committee in a plenary session was held immediately after the partys Congress, on the theme personnel, discussing election Centrals top leaders, such as the election of the Standing Committee of the political Bureau, through the Central Committee members, decisions, such as members of the Central Military Commission. The second plenary session, is held in two sessions before the general election, mainly to discuss a new State personnel issues. But by the third八年级上册物理期中测试题(时量:90分钟 范围:13章 满分:100分)试卷说明:本卷包含各校名题、本人改编题和原创题,试卷难度适中,但题量稍大,主要考察学生对教科书重点概念的掌握,对简单物理现象的认识及应试技巧。此卷是本人暑期家教期间所创,因水平有限和时间仓促,难免有纰漏和不足之处,望各读者加本人QQ(同百度账号)给予指导和批正,谢谢!一、 选择题:(1*30)1.下面关于声现象的一些叙述,其中正确的是()A.只要物体在振动,我们就一定能够听到声音B.太空中的宇航员可以直接用语言交流C.雷声是由于空气振动发声的D.狗趴在地上睡觉,耳朵贴着地面,很容易发觉人走动,是因为狗的耳朵特别灵敏2.蝴蝶在飞行时不停地扇动翅膀,但我们不能听到蝴蝶飞行的声音,这是因为()A人耳有故障B.翅膀振动发出的声波响度不够大C翅膀振动不产生声波D翅膀振动的频率比较小3.能说明“液体可以传播声音”的事例是()A我们听到雨滴打在雨伞上的“嗒嗒”声B.我们听到树枝上小鸟的“唧唧”声C将要上钩的与被岸边的说话声吓跑D.人在小溪边听到“哗哗”的流水声4.正在拉二胡的一位同学不断用手指去控制琴弦,这样做的目的是()A.使二胡发出不同的音调B为了获得更好的音色C.为了获得更大的响度D阻止琴弦振动发声5.甲同学在一根较长的注满水的水管的一端用石头敲击一次,乙同学在水管的另一端用耳朵贴着水管听声。乙同学听到的声音次数是()A一次B.两次C.三次D.四次6.小明拍完毕业照合影后,想拍一张单身照,摄影师应采取的方法是()A使照相机靠近他,同时镜头往后缩,离胶片近一些B使照相机靠近他,同时镜头向前伸,离胶片远一些C使照相机远离他,同时镜头往后缩,离胶片近一些D使照相机远离他,同时镜头往前伸,离胶片远一些7.检查视力时,人眼与视力表的距离应为5m,可是检查视力的房间东西墙壁最大的距离为3.5m,此时,眼科医生把视力表挂在东墙上,在西墙上挂一面大平面镜,此时被检查者应面向西坐在平面镜前合理的位置是()A距镜面3mB.距镜面2mC距镜面1.5mD.距镜面1m8.物体在平面镜中所成的像的大小取决于()A镜面的大小B.观察者的位置C.物体的大小D.物体与镜面的距离9.俗话说“坐井观天,所见甚小”,能解释这一现象的是()A.光的直线传播B.光的反射C.光的折射D.光的色散10.某人以1m/s的速度沿着平直的河堤行走,他在平静的河水中的倒影相对于河堤的速度是()A.1m/sB.0.5m/sC.0D.2m/s11.潜入游泳池水中的运动员仰头看体育馆墙壁上的灯,他看到的灯的位置()A.比实际位置高B.比实际位置低C.与实际位置一样高D.条件不足无法判断12.“女高音歌唱家”和“男高音歌唱家”,这里的“高”和“低”指的是()A.音调B.响度C.音色D.都有可能13.下面几个现象中与光的反射有关的是()A.太阳光下物体的影子 B.通过汽车的观后镜看车后方情景C.晚上看到的五颜六色的霓虹灯光D.利用激光给隧道准直14.小明从平面镜里看到镜子对电子钟示数的图像如图,这时的实际时刻是()A21:10B10:21C10:51D12:0115.人耳能分清前后两次声音的时间间隔应大于1/15秒,据此,要想听到自己的回声,人离障碍物的距离应()A 大于11.3米B 小于22.6米C 小于11.3米D 大于22.6米16.下列现象中,不能用光在均匀介质中传播的原理来解释的是()A.平静的水面映出山的倒影B.日食、月食的形成C.影子的形成D小孔成像17有一台光电控制液面高度的仪器,它通过光束射在液面上的反射光线打到电光屏(能将光信号转化为电信号进行处理)上来显示液面的高度,然后通过装置调节液面的高度。如图,所示的光路图,电光屏上的光点由s1移到s2时,表示液面的高度()了A.上升B.下降C.不变D.不确定18声音在传播过程中,下列说法正确的是()A.音色会逐渐改变B.音调会逐渐降低C.响度会逐渐降低D.声音的音色、音调和响度都不会改变19某同学对着平面镜,从镜中看到一只没有数字的挂钟,读到的时间是3点零5分,则实际时间应是()A.2:55B.3:05C.8:55D.9:0520.在四个墙角安放几个平面镜,可以让手电筒的光柱在教室里环绕一周,至少安放平面镜的个数是()A.4个B.3个C.2个D.1个21夜晚某人在一盏路灯下,先走近路灯后走远,此人影子的长短变化情况是()A.逐渐变长B.逐渐变短C.先变长,后变短D.先变短,后变长22在平静的湖水中看到“鱼儿在云中游”的景象,看到的鱼和云实际上是()A.云是实像,鱼是虚像B.云是虚像,鱼是实像C.云和鱼都是实像D.云和鱼都是虚像23我们用幻灯机放幻灯片时,幻灯片到凸透镜的距离是25cm,则幻灯机凸透镜的焦距可能是()A.10cmB.20cmC.30cmD.40cm24把物体放到凸透镜前16cm处可得到放大的、倒立的实像;现将物体向凸透镜移近8cm时,得到的是()A.倒立放大的实像B.正立放大的虚像C.倒立缩小的实像D.无法判断25晴天的时候,树荫下的地面上,会出现圆形的光斑,这圆形的光斑是()A.太阳的实像B.太阳的影子C.树叶的影子D.以上说法都不对26雨过天晴的夜晚,为了不踩到地上的积水,下面判断中正确的是()A.迎着月光走,地上暗处是水;背着月光走,地上亮处是水B.迎着月光走,地上亮处是水;背着月光走,地上暗处是水C.迎着月光走或背着月光走,都应是地上发亮处是水D.迎着月光走或背着月光走,都应是地上暗处是水27小明拿着一个直径比较大的放大镜,伸直手臂观看远处的物体,可以看到物体的像。下列说法中正确的是()A.观察到的像一定是正立的像B.观察到的像一定是虚像C.观察到的像一定是倒立的像D.观察到的像一定是放大的像28下列现象中属于光的反射的是()A.在缓缓流淌的河水中可以看到河边垂柳的倒影B.注满水的游泳池,池底看起来变浅了C.人在阳光下,地面上出现影子D.筷子斜插入水中,水下部分看起来上翘了29岸上的人观察到的下列现象中,属于光的折射的是()A.水中月B.水中楼的倒影C.水中的鱼D.水中彩霞30古诗词中有许多描述光学现象的诗句,如“潭清疑水浅”和“池水映明月”分别说的是_现象和_现象。()A.折射,折射B.折射,反射C.反射,反射D.反射,折射二、 填空题(2*15)1. 声是由物体的_振动_产生的,声的传播需要_。2. 声速跟介质的种类有关,还跟介质的_温度_有关,15时空气中的声速是_m/s。3. 声音三个特性为_、_、_。音调的高低由发声体的_频率_决定,响度是由声源的_振幅_决定的。4. 控制噪声要从_、_、_三个方面入手。5. 蝴蝶的翅膀每秒钟振动五、六次,它所发出的生硬低于20 Hz,为_波,而海豚能能发出振动频率高于20 000 Hz的声音,为_波。上述两种频率的声音,人耳_听见(“都能”或“都不能”)。6.科学工作者为了探测海底某处的深度,向海底垂直发射超声波,经过4s接收到回波信号,海洋中该处的深度是_m(声音在海水中的传播速度是1500m/s);这种方法不能用来探测月球与地球之间的距离,其原因是_ _。7.蛇是一种可怕的动物,经常将头帖子地面上,对外界声音的刺激非常灵敏,但蛇没有耳朵,它利用_方式来“倾听”敌人的声音。8.神话中的孙悟空一个跟斗飞行的距离是十万八千里(约为5.4104 km),设翻一个跟斗的时间是1s,则孙悟空飞行的速度_真空中的光速(填“”“”“=”)。9.真空中的光速是c=_m/s,是宇宙间最快的速度。从比邻星发出的光,要经过4.3年传到地球,那么比邻星与地球相距_千米,为_光年。10.色光的三原色是_,彩色电视机画面上的丰富色彩就是由三原色光_而成。11.有些步枪在瞄准器上安装上_线夜视仪后,在黑夜也能寻找目标进行射击。日光灯发光是由灯管内辐射出的_线,激发了敷在灯管内壁的荧光粉而发光的。12.排纵队时,如果你看到自己前面的一位同学挡住了所有的人,队就排直了,这可以用_光的直线传播_来解释;雷雨时,先看到闪电,后听到雷声,是由于_。13.一束与镜面成60角的光线射到平面镜上,反射角的大小为_;一束光垂直射到水面上,入射角为_,折射角为_。14.能够从不同方向看到一些本身不发光的物体,是因为光在物体表面发生_的缘故,这时,每一条反射光线都_反射规律(填“遵守”或“不遵守”)。15.将物体放在距凸透镜2倍焦距外时,在凸透镜另一侧某处成_像。三、 作图题:(4*3, 5*2)1 作出折射光线:42 根据光路作出平面镜放置的位置:43 作出光线穿过凹透镜后的路径:44 作出反射光线,并标出入射角和反射角:5s5 画出下图中发生的所有反射和折射光线(注意标明法线):5四、 计算题:(6*3)1、一列火车以20m/s的速度在平直的铁轨上匀速行驶,鸣笛后2s内收到前方障碍物反射回来的声音,此时司机立即刹车。问刹车处司机距障碍物多远?(答案:320m)2、一束光线与水平面成24角,要使反射光线沿水平方向传播,那么平面镜与水平面所成的度数是多少?(注意作出示意图) (答案: 78或12)3、已知眼镜的度数等于焦距的倒数乘100,(如:某远视镜片的焦距是1m,则该眼镜的度数是100度)。现有一副+400度的眼镜和一副-300度的眼镜,请指出哪一副是老花眼镜,并算出该眼镜镜片的焦距。(答案:度数为+400的眼镜是老花镜,该眼镜的焦距是4m)采购的食品原料及成品必须色、香、味、形正常,不采购腐败、变质、有毒有害、霉变生虫、过期、混有异物或感官性状异常及其他不符合卫生标准要求的食品。plenary session, each session of the Central Committee of national institutions and personnel problems have been arranged, you can concentrate on national development and reforms. Previous plenary session is often branded with a central leading collective, often by looking at the third plenum of the initiative to found the current central leadership collective governance characteristics. From the analysis of the process of economic reform in China, plenary session, 12 session, 14, 16 plenary session have programmatic meaning, respectively, marking the four stages of Chinas economic reform, and that the start-up phase of reform, reform, construction phase and perfecting the Socialist market economy framework stage of socialist market economy. Previous plenary session topics proposed to the third plenary session of taking class struggle as the key link, shifted to socialist modernization; 12 session marked the change from rural to urban, established with public ownership as the Foundation of a planned commodity economy; 13 session at a time when both the old and the new system change, governance and rectify the economic order; 14 . Fair and efficient and authoritative Socialist judicial system, safeguard the peoples interests. Legal authority to uphold the Constitution, deepening the reform of administrative law enforcement, ensure that the right to exercise judicial power independently and impartially according to law the prosecution, perfecting the running mechanism of judicial power, improve the system of judicial protection of human rights. Plenary session, Affairs the right to adhere to the system, and let the people authority to let the power run in the Sun, is shut up in a cage of the system power policy. Decision Science, implementation should be constructed strong, supervise the running of powerful system, improve the system of punishing and preventing corruption, promoting political integrity, and strive to achieve cadres honest and Government integrity, clean politics. To form a scientific and effective coordination of power restriction and mechanisms to strengthen anti-corruption institutional innovation and institutional protection, sound improvement style normal system. Plenary session, building a socialist culture in China, enhanci

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