Then, by the aid of the self-made piezoelectric vibration table, experiments of vibration drilling were done on duralumin (2A12) and stainless steel (0Cr18Ni9), and the aperture size, surface topography and surface roughness were tested.

在此基礎上wwwwww18岁黄色禁，利用自制的壓電式振動工作臺進行了硬鋁和不銹鋼的軸向振動鉆削實驗男插女福利，并對孔徑大小、表面形貌和表面粗糙度進行了測量嗯a操我视频。

The group's economic geography is as spectacular as its topography.

這一組織的經(jīng)濟形態(tài)如同它的地貌一樣引人入勝国产美女av网址。

The general forms of the conservation of momentum, t emperature and potential vorticity of coastal ocean are obtained in the xz pla ne for the nonlinear ocean circulation of Boussinesq fluid, and a elliptic type partial differential equations of second order are derived. Solution of the part ial differential equations are obtained under the conditions that the fluid move s along the topography.

在考慮了陸架地形后，在垂直海岸的xz剖面上亚洲黄色视视频，對Boussinesq流體的非線性海洋運動方程求得了總動量守恒a插插黄色毛片视频网站、溫度守恒和位勢渦度守恒的普適形式，進而得到流函數(shù)所滿足的橢圓型二階偏微分方程xxxx黄色小视频，在給定流體沿地形運動的條件下超碰97人人操人人，算出問題的解。

Methods:115 emmetropia eyes and 115 myopia eyes were measured by using a computerized corneal topography.

應用計算機輔助的角膜地形圖檢測分析了115只兒童正視眼和115只兒童輕中度近視眼人人爽爽人日人干人日人。

Object To study the shape feature of the children′s corneal surface emmetropia with keratometry and corneal topography.

目的 應用角膜曲率計與角膜地形圖儀研究兒童正視眼角膜表面形態(tài)特征AV无码A在线观看奶水。

Methods Corneal curve of sixty cases (115 eyes) of emmetropia was examined by keratometry and corneal topography respectively. The data of CIM and SF have been got also.

對60例(115眼)正視眼兒童進行角膜曲率計與角膜地形圖儀測量，并得出角膜不規(guī)則指數(shù)與角膜表面形狀系數(shù)国产色污污视频在线观看。

ABSRTACT:Object to study the shape feature of the children′s corneal surface emmetropia with keratometry and corneal topography.

摘 要：目的應用角膜曲率計與角膜地形圖儀研究兒童正視眼角膜表面形態(tài)特征国产精品一区二区综合亚洲。

Methods One hunderd amd ten human subjects (one hunderd and seventy-four eyes) were included in this research. Retinoscopy was made to measure refractive errors, corneal topographer was measured by corneal topography system, Tonometry was used to measure IOP, Ultrasonagraphy was applied to measure anterior chamber length, len thickness and vitreous length respectively, Laser interference biometer was used to measure axial length, Optical coherence tomography was used to measure retina thickness of fovea area. Based on spherical equivalent subjects were divided into four groups: emmetropia group (SE0.50D), low-myopia group (-0.50D≤SE3.00D), moderate myopia group (-3.00D≤SE6.00D) and high myopia group (SE≥-6.00D).

對近視患者及正視者110例（174只眼），主覺加檢影驗光行屈光檢查嫩白少妇初次吞精A片一級A片，采用Humphrey測量角膜平均曲率老女人老肥熟国产在线视频，非接觸式眼內(nèi)壓測量儀測量眼內(nèi)壓；A與B型超聲診斷儀測量前房深度2019免费黄片、晶狀體厚度精品综合久久久久久9、玻璃體腔長度及眼軸長度；角膜測厚儀測量中央角膜厚度(CCT国产亚洲美女最新精品网站，centercornealthickness)国产女优视频播放；光學相干生物測量儀測量眼軸長度；光學相干斷層掃描儀測量黃斑中心視網(wǎng)膜厚度91大屁股精选；按等效球鏡度數(shù)(SE特级欧美淫秽视频展播， sphericalequivalent)不同分正視組(SE0.05D)、輕度近視組(-0.50D≤SE3.00D)AAAAAA级特色特黄的毛片、中度近視組(-3.00D≤SE＜-6.00D)亚洲国产精品成熟老女人亚洲国产精品、高度近視組SE≥-6.00D）。

Thus, Galileo enchantingly guides the reader to understand why the appearance of isolated bright spots among otherwise dark areas implied a rough topography where previous investigators saw only a mottled coloration of an otherwise smooth sphere.

因而黑大粗高潮视频在线观看，伽利略以引人入勝的方式引導讀者理解欧美ⅩXXA片免费看，出現(xiàn)在暗區(qū)內(nèi)的孤立亮點，為什麼暗示有崎嶇的地形wwwjizzcom，而先前的研究者認為那只是光滑球面上的一個雜色斑點婷婷,五月天综合。

By using the method of space substituting time, alpine-cold steppe in different ages of enclosing was studied. We selected 4 flat plots with relatively uniform topography and enclosed time were 1-year old exclosure (E1), 3-year old exclosure(E3), 5-year old exclosure (E5), unexclosure. The grasslands were freely grazing pasture, grazing rate of 5.7 sheep / hm2. After enclosure, it was used as spring pasture, 5.7-grazing sheep / hm2. Unexclosure plot were 5.7-grazing sheep / hm2 in addition to the winter.

本文，運用空間代替時間的方法對不同圍封年限的草地進行研究，結(jié)果表明：（1）隨著圍封年限的延長人人干人人操内射，天山賴草種群在群落中的地位逐漸弱化美女被狂操到高潮视频网站，優(yōu)良牧草羊茅和紫花針茅種群在群落中的優(yōu)勢逐漸體現(xiàn)出來，群落由天山賴草+黃花棘豆群落類型逐步向羊茅+紫花針茅群落類型過渡色视频操暴力。