A plain or notched , often wedge - shaped piece of wood or metal designed to hold parts of a machine or structure in place or provide a bearing surface , usually adjusted by a screw or key 扁柱，夹条，凹字形楔一种平的或有凹的经常是一块楔形的木头或金属，用来在一定地方夹住机器或结构的各部分或提供轴承的表面，通常是由螺丝或钥匙来调整
For a number of historical and technical reasons , hockney envisions a camera obscura based not on a lens but on a concave mirror ( curved inward like a shaving or makeup mirror ) , which can also project an image onto a screen 由于历史与技术上的若干理由，霍克尼推想出一种不采用透镜、却利用凹面镜的暗箱（凹面镜是一种内凹的镜子，比如刮胡子或化妆时用的镜子） ，这种镜子也可以把影像投射到屏幕上。
Jia ping - wa ' s mystical works with fairy tales and magic stories create a clear but simple . mysterous but true literary mood which is a great breakthrough to mysterous values and reflects the author ' s pursuit of natural perfection in literary creation 贾平凹的小说世界是由形形色色的神话传说和灵异故事编织而成的，这种神秘主义的小说创作，是对神秘性价值观的一个突破，创造了独特的清灵而拙朴、神秘而真实的意境，充分地体现出作者寻找通往自然完美之路的创作追求。
This paper introduces the interference source of the test system interference and gives some hardware measures to improve the anti - interference ability of system . data fitting is a question that must be taken into account in test system design . this paper gives the demarcating formu1as for linear system and discusses some means for data fitting of nonlinear system and the least squares method - is also discussed in detail 口的使用方法的基础上，详细讨论了使用n口进行一键多功能的键盘设计方法，给出了本课题中所设计的键盘的各按键的功能及程序框图：详细介绍了72凹的软件设计方法，并给出了其程序设计枢图；在软件设计部分的最后，论文给出了木测量系统中微处理其系统在运行过程中可能出现的一些问题及其解决方法，以及软件抗干扰措施。
Considering the similitude law for shaking table test , we study the test results and obtain some conclusions which are a ) generally , the silty soil in test box liquefies and the liquefied time has relation with the amplitude of acceleration , b ) when the intensity is on and above eight degree , the silty soil deposit will be liquefied dramatically , c ) the relationship of the pore water pressure is relevant to the cycle loading which represents when the cycle loading ranges from little to great , the relationship is represent as a concave curve , or else as a protruding curve and tends to stability . ( 3 ) based on the triaxial compression test and the resonant column test , some studies are made such as a ) the duncan - chang parameters of constitutive model , b ) the dynamic shear modulus ratio and c ) the damping ratio of the site soil deposits . in order to deal with the test data , a computer program is compiled ( 2 )利用小型振动台进行了k _ 0固结状态下粉土的振动液化模拟研究，通过分析正弦荷载作用下的试验资料，验证了粉土的孔隙水压力增长模式的合理性；从微分方程推导了基于土体振动台模型试验的相似律，并从模型实体、孔压时程曲线和相似律等方面做出了分析，得出了如下结论：在小型振动台试验中，模型箱中的粉土都发生了液化，液化的时刻和输入加速度幅值有关，而对频率的变化不太敏感；粉土在相当于8 9度地震烈度的加速度幅值作用下可能产生严重的液化；孔压的增长曲线形状与施加的荷载有关：当施加荷载为由小到大的形式时，曲线形状为上凹的曲线；当施加荷载为等幅的正弦荷载或荷载幅值由大到小时，曲线形状为上凸的曲线，且逐渐趋于稳定。
Red blood cells were imged by afm and the typical biconcave shapes were observed . the ultrastructure of rbc membrane was also gained . the morphological changes of red blood cell ( rbc ) membrane after the interaction of trichosanthin ( tcs ) were clearly observed by afm 对红细胞进行成像，观察到红细胞双面凹的典型特征，小范围扫描观察到了红细胞膜表面的超微结构，在此基础上研究了红细胞与天花粉蛋白作用后红细胞膜表面超微结构的变化，并对二者作用的机理进行了分析讨论。
By analyzing " qin qiang " by jia ping - wa and " brother " by yu hua , two influential novels in china , the tendencies of novel composition since the new century are discussed . " qin qiang " is a " simulated realism " novel , in which society , nature , and life itself are simulated , while " brother " is a " mysterious realism " novel , in which exaggerated and mysterious devices are employed 摘要本文通过对贾平凹的《秦腔》和余华的《兄弟》这两部较有影响的长篇小说的具体分析来探讨新世纪以来长篇小说的创作趋向，在这两部有标志性的作品中， 《秦腔》可以称做是一种模拟社会、模拟自然、模拟生活本来面目“法自然的现实主义” ； 《兄弟》是以夸张和怪诞的手法创作的怪诞的现实主义。
On the east terrace - fault slope of the depression , the sedimentary mode of fan - shaped delta - slump turbid fan - deep lake facies are developed . on the long axial direction of fula depression , the southeastern groove was filled with a large scale delta which was the main sources , the other little delta limited by the 3 syndepositional fault was distributed down the slope edge of the northern sub - depression . this stage developed a favorable oil sources , reservoir and regional seal which formed the good matching relations of generation , reservoir and seal in the time - space zone Abugarbra组的sc和sd层序发育在边界断层和同沉积断层活动剧烈、湖盆扩张期，凹陷中心发育半深湖-深湖相沉积，在凹陷陡坡发育近岸水下扇，断阶缓坡带发育扇三角洲?滑塌浊积扇?深湖相组合，长轴凹槽和北部次凹的北部缓坡带发育三角洲体系，此层位是有利生油层和岩性圈闭发育层段。
