妊娠后期超声能看清胎盘下缘与子宫内口关系，正常应大于_____cm。

试分析运行中填料发热的原因及处理方法。

阅读下文，回答后面问题。

　　看芭蕾舞剧《天鹅湖》，用望远镜细观台上，不是紧盯着王子和白天鹅，而是逐个地扫描那些配舞的天鹅，除了“三大天鹅”、“四小天鹅”外，还有若干毫不能令观众特别瞩目的“众天鹅”，而在她们当中，当舞姿“凝固”时，也还有排在前列与隐在后面的区别，于是从望远镜中注意到，在最后面，一位天鹅双腿优雅地分立，头颈微偏，双手兰花般交错于翘起的裙裾上，身影与其他天鹅同样的美丽，在耐心地作为暗景中的“绿叶”，以衬托主角王子与白天鹅在追光中的“红花”怒绽。随着舞曲的流动，众天鹅也开始缓缓变换姿势，于是我从望远镜中，清晰地看到排列在最后的天鹅的细部，她的眉目，精心化妆后依然掩饰不了岁月的风霜，转动时，显露出锐瘦的锁骨，以及背后同样“锋利”的肩胛；可是，她虽隐于最后，却也满脸凄恻，浑身是戏。乐音陡变，众天鹅如风中白莲般翕合旋舞，转瞬间，我已不能再找到那位资深的舞娘……

　　我的思绪，飘出了《天鹅湖》，飘出了王子与白天鹅悲欢离合的故事。我在猜想，那位资深的舞娘，她有着怎样的个人命运？当年她献身芭蕾这一“残酷的艺术”，不惜脚趾流血，苦练虚脱，一定杯着充当舞台追光下的白天鹅的美梦，她曾圆过这个梦吗？也许，若干年前，她确曾是众星所捧的那个“月”，可是，时光无情，后生可畏，她渐渐地，先是让出白天鹅这个主角，再让出“三大天鹅”之一的位置，在演出的说明书上，从“挂头牌”，到名字列于后面，到隐入于“本院演员”的模糊概念中……也许，更残酷的是，她竟从未跳过主角，终其一生，也只是充当“绿叶”，并且总在“亮相”时，隐于最后一列，双手兰花般交错予翘起的裙裾上……每当那个时刻，她都能化入剧情之中，而不“走神”于自身命运的吟唱么？

　　给整台演出所献的花篮，虽然也含有她的一份，但那整把的鲜花，是只献给主角的。我心中有个冲动，演出结束后，单给她，这资深的舞娘，献上一大束丰满的百合花。我把望远镜递给旁座的朋友，请他注意那位宛转于舞台暗区的资深舞娘，他先是莫名惊诧：“看她作甚？”及至看清了，咂舌道：“天哪，这老天鹅，还舍不得退出舞台，跳个什么劲儿么！”我接过他递回的望远镜，觉得透心地凉，不是朋友错了，不能怪他刻薄，甚至于，他那真实的直觉与非功利的直率，恰恰道破了人生、人性、人际的某些底蕴。可是我想哭，不独为那资深舞娘，也为了天下许许多多诸如此类的人生，当然，也包括我自己……

　　出了剧场，花亭还在营业，我买下了一大束昂贵的百合花，紧紧地拥在自己胸前……

　　（注）资深：资历深或资格老。

1．从第一段看，资深舞娘的舞技怎样？她在舞台上的作用是什么？

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2．第二段中，对资深舞娘，作者“猜想”了她有怎样的命运和追求？

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3．第三段末“也为了天下许许多多诸如此类的人生，当然，也包括我自己……”一句蕴含了作者什么的愿望？

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4．读了全文，你认为作者要把百合献给“谁”呢？

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下列有关新纹状体的叙述哪项正确（）

A.主要神经递质是去甲肾上腺素

B.包括苍白球和尾状核

C.为主要的下行纤维发起处

D.包括壳和尾状核

E.为皮质下的感觉整合中枢

The world is filled with smart, talented, educated and gifted people．We meet them every day A few days ago, my car was not running well．I pulled it in to a garage and the young mechanic had it fixed in just a few minutes．He knew what was wrong by simply listening to the engine．I was amazed．The sad truth is that great talent is not enough．

　I am constantly shocked at how little talented people earn. I heard the other day that less than 5 percent of Americans earn more than $100,000 a year. A business consultant who specializes in1 the medical trade was telling me how many doctors and dentists struggle financially. It was this business consultant who gave me the phrase, “They are one skill away from great wealth．”

There is an old saying that goes, "Job means 'just over broke（破产）’"．And unfortunately, I would say that the saying applies to millions of people．Because schools do not think financial intelligence is intelligence, most workers "live within their means"．They work and they pay the bills．Instead I recommend to young people to seek work for what they will learn, more than what they will earn．

When I ask the classes I teach, “How many of you can cook a better hamburger than McDonald's?” almost all the students raise their hands. I then ask, “So if most of you can cook a better hamburger, how come McDonald's makes more money than you?” The answer is obvious: McDonald's is excellent at business systems. The world is filled with talented poor people. They focus on perfecting their skills at building a better hamburger rather than the skills of selling and delivering the hamburger.

小题1:The author mentions the mechanic in the first paragraph to show that      ．

A．he is just one of the talented people

B．he is ready to help others

C．he has a sharp sense of hearing

D．he knows little about car repairing小题2:The underlined part in the third paragraph can be best replaced by____   ．

A．spend more than they can afford

B．do in their own way

C．1ive in their own circle

D．1ive within what they earn小题3:Why do talented people earn so little according to the author?

A．They don’t work hard enough

B．They lack financial intelligence．

C．They don't make full use of their talents

D．They have no specialized skills．小题4:The main purpose of the author is to tell us____      ．

A．how young people can find a satisfactory job

B．What schools should teach about finance

C．why so many talented people are poor

D．how McDonald's makes much money

下列对牛顿第二定律的表达式F= ma及其变形公式的理解正确的是  [ ]

A．由F= ma可知，物体所受的合力与物体的质量成正比，与物体的加速度成反比

B．由m= F/a可知，物体的质量与其所受合力成正比，与其运动的加速度成反比

C．由a= F/m可知，物体的加速度与其所受合力成正比，与其质量成反比

D．由m= F/a可知，物体的质量可以通过测量它的加速度和它所受的合力求出