Fluoride can increase the hardness of the teeth; that calcium fluoride in the enamel of the higher proportion of teeth, the greater the hardness.

答：（1）氟可以增加牙齒的硬度国模大尺度A片在线观看，這在牙齒琺瑯質(zhì)的比例較高氟化鈣国产精品猎奇国产精品无码，硬度越大。

The results indicated that there are always 17 teeth of each row symmetrically arrayed in the radula of polyplacophora,among which the interior lateral teeth showed significant interspecific...

在國內(nèi)首次根據(jù)多板類軟體動物的齒舌形態(tài)差異及外部形態(tài)特征編制福建沿海多板類軟體動物分類檢索表欧美乱人伦中文在线观看暴力，并提出與傳統(tǒng)分類不同的觀點在线观看性爱视频。

Hypohidrosis ectodermal dysplasia is a rare congenital disorder that results in abnormalities in the structures of ectodermal origin tissues, such as teeth, eccrine sweat glands, hair and nails.

少汗型外胚層發(fā)育不良癥是一種罕見的起源于外胚層組織，如牙一级色晴A片免费、汗腺欧美黄色一级性视频、毛發(fā)等發(fā)育異常的遺傳性疾病。

Based on the developed iron loss of surface-mounted permanent magnet machine of Slemon and Xian Liu, the expressions of the peak and the time rate change of flux density in the teeth and the yoke are derived, considering the beveling edges of the PM. According to the basic concept of the eddy current loss, the analytic calculations of the average eddy current loss density in the teeth and the yoke are presented respectively. Hence, a calculation method for the iron losses of PM with beveling edges is presented.

在Slemon和Xian Liu表面置磁型永磁電機改進鐵耗算法的基礎(chǔ)上能免费看av的网站，分別推導(dǎo)了考慮磁體邊緣斜角時定子齒與軛的磁通密度的幅值及其時間變化率的表達(dá)式日韩欧美大陆私拍在线观看，結(jié)合渦流損耗的基本概念，分別提出了永磁電機定子齒與軛的平均渦流損耗密度的解析計算方法欧美激情aaa，由此建立了永磁電機鐵耗的解析模型免费乱理论A片在线观看八戒。

By the use of CAD method to carry out the research on key problems of three ring typed less teeth difference reducer-the inner and outer gears have to be designed by adopting modified transmission was advanced. And to study a method for carrying out numerical calculation by adopting the powerful functioned mathematical software MATHCAD in the solution of coincidence extent on less teeth differenced internal messing and in iterative computation for equation set of interference coefficient of tooth profile overlapping.

提出用CAD法研究三環(huán)式少齒差減速器設(shè)計的關(guān)鍵問題―內(nèi)外齒輪必須采用變位傳動的設(shè)計，并研究在求解少齒差內(nèi)嚙合的重合度和齒廓重疊干涉系數(shù)方程組的迭代計算中欧美日韩在线视频一区二区，選用功能強大的數(shù)學(xué)軟件MATHCAD進行數(shù)值計算的方法特黄特黄的AAAAA片。

In 1998 and set up factories, specializing in the production of excavator bucket teeth, tooth Block series, loader-ho teeth, knives plate series.

福建省屏南縣鼎興合金鋼鑄業(yè)有限公司于1998年建廠，專業(yè)生產(chǎn)挖掘機斗齒国产性在线、齒座系列日韩欧美最新最近黄片、裝載機鎬牙、刀板系列www.欧洲视频在线观看。

Jesus then instructed Adam and showed him the Father's dwelling in the celestial heights, and Jesus showed him his own personality, exposed to all things, to the teeth of the panther, the teeth of the elephant, devoured by the greedy, swallowed by gluttons, eaten by dogs, mixed with and imprisoned in all that exists, encompassed by the evil odours of Darkness.

然后耶穌指示亞當(dāng)和顯示他的父親住在該天體的高度999国内精品永久免费视，和耶穌顯示了他自己的個性，接觸到的所有東西色色人人，到了牙齒的黑豹9299yy看片婬黄大片在线，牙齒的大象，狼吞虎咽的貪婪吞噬的老饕男人强奸裸体老女人视频，吃了狗欧美黄色免费网站一区二区，混合www.久久艹，并在所有被監(jiān)禁的存在，所包含的邪惡黑暗的氣味性生活A片一级视频。

Jesus then instructed Adam and showed him the Father's dwelling in the celestial heights, and Jesus showed him his own personality, exposed to all things, to the teeth of the panther, the teeth of the elephant, devoured by the greedy, swallowed by gluttons, eaten by dogs, mixed with and imprisoned in all that exists, encompassed by the evil odours of Darkness.

耶穌當(dāng)時指示顯示性欧美XXXX大乳喷水，亞當(dāng)和他父親的住家，在天體的高度欧美女一级片，和耶穌表明他自己的個性国产一级黄片一区二区，暴露了所有的東西，到了牙齒的豹殴美真人操逼免费看，牙大象欧美老妇性性行为，吞食由貪婪所吞噬gluttons ，吃狗蜜桃视频午夜播放网站免费观看大全，混合和被囚禁在所有存在的A片197com网址，所涵蓋的邪惡黑暗的氣味。

Shi Jing-Ru:嗜eating acidic food or carbonated drinks Aihe people to be careful teeth may have been etching, resulting in the loss of enamel, may be seriously exposed to nerve pulp, a dental root canal treatment, and even pulled out teeth.

嗜吃酸性食物或愛喝碳酸飲料的人欧美视频一区久久黑，要小心牙齒可能遭到酸蝕人人澡人人澡人人看欧美，造成琺瑯質(zhì)流失，嚴(yán)重時可能牙髓神經(jīng)露出來国产精品馆，得接受牙醫(yī)根管治療欧美性爱www，甚至拔掉牙齒。

The central inner gear theory equation and tooth profile work equation with two-teeth difference cam profile rolling movable teeth were deduced, and in the consideration of central gear influenced by several parameters, the central gear tooth profile modification mode was analyzed and synthesized roundly.

推導(dǎo)二齒差凸輪激波滾動活齒傳動的中心內(nèi)齒輪理論方程及工作齒形方程内射合集在线视频，在給出考慮各參數(shù)影響的中心輪修形通用方程的基礎(chǔ)上视频一视频二无码在线有限公司，較為全面地對中心輪齒廓的幾種修形方式進行分析和綜合。