Methods : we have divided the 636 molars ( without dental caries or pathological changes of root ) collected in school of forensic medicine and stomatological hospital in shanxi medicine university into four groups : maxl, max2, manl, man2, and selected 5 indexes closely related to changes of dental age ( dental attrition, contact area, the index of dentine marrow cavity, the thickness of cementum of root, the diaphaneity of dentine of root ), and proposed the grading standard and scoring standard date processing and statistical analysis after measuring the teeth of the four groups
方法：從山西醫科大學法醫學院及口腔醫院收集的636磨牙（無齲壞、無根尖病變）分為max1 、 max2 、 man1 、 man2四組，根據牙
齒的增齡變化特點，篩選了5個與牙齡變化密切相關的指標（牙
齒的磨耗、接觸區面積、牙本質髓
室指數、根尖牙骨質的厚度、根尖牙本質透明） ，提出了指標的分級標準和評分標準，對各組的牙
齒測量后進行數據處理和統計分析。
Results : all the five indexes ( dental attrition, contact area, the index of dentine marrow cavity, the thickness of cementum of root, the diaphaneity of dentine of root ) revealed a highly interrelated relationship with age. regression height was significant when the multiple regression equation, which was formulated with these five indexes and age and used to judge the age was statistically analyzed
結果：牙
齒的磨耗、接觸區面積、牙本質髓
室指數、根尖牙骨質的厚度、根尖牙本質透明均反映出與年齡高度相關關系，用這5個指標與年齡所建立的判別年齡的多元回歸方程經統計學分析，回歸高度顯著。
In a recent lab test, photodynamic therapy killed 99. 9 percent of the bacteria that cause gingivitis in - - 10 minutes. clinical trials are scheduled for later this year
在最近的一次實驗
室測試中，光力學療法在10分鐘之內殺死了一種引起
齒齦炎的病菌的」 99 . 9臨床實驗也定在今年的晚些時候進行。
On the bridge main engine instrument board, there is main engine cooling water thermometer, lub oil pressure gauge, main engine revolution indicator, main engine emergency shutdown pushbutton, and there is audible and visual alarm device for main engine lub oil low pressure, cooling water high temperature, gear box lub oil low working pressure
本船駕駛
室主機儀錶板設有主機冷卻水溫表、滑油壓力表、主機轉速表、主機應急停車按鈕，並具有主機滑油壓力低、冷卻水高溫、
齒輪箱滑油工作壓力低的聲光報警裝置。
Her teeth, as her thirties wore on, gave her trouble, and the orthodontics and periodontics specialists she regularly consulted had their offices in the nearby middle - sized city, in a tall building across from the one in which les worked as an investment counsellor
三十好幾之後，牙
齒開始找她的麻煩；她經常去咨詢的正牙專家和牙周病專家的辦公
室就處在附近的那座中型城市，他們辦公的那棟高樓正好座落在他擔任投資顧問上班的那幢大樓對面。
At bell labs, gabriel learned from making gears, miniature tongs and other micronovelties that, to become a commercial reality, any device would need to have a well - defined purpose ? and it would have to be readily manufacturable using conventional semiconductor processes
在貝爾實驗
室里，蓋布瑞從製造
齒輪、微型鉗子和其他微型元件中學到，要能夠商品化，所發明的裝置必須具備明確的目標，同時必須容易地以傳統半導體製程製造出產品。
Drawing office practice for gears
齒輪的繪圖
室實施規程
This tester is suitable to measure accuracies of pitch deviation with inside and outside straight helical circular gear among seventh degree. easy to operate and maintenance
適用於檢查7級或低於7級精度的內外
齒合直
齒與斜
齒圓柱
齒輪的周節偏差。操作簡便，易於維修，可供各工廠計量
室及車間使用。
Portuguese scientists said they had developed an experimental vaccine against tooth decay which was successful in laboratory tests on rats and could pave the way for a version that works for humans
葡萄牙科學家說，他們研發出一種實驗性疫苗能防止蛀牙，而它已在實驗
室的老鼠身上證實有效，這將有助開發防止人類齲
齒的疫苗。
The establishment of gear fault data warehouse the paper studies several gear cases in drive lab of wuhan university of science and technology. the signal of normal gear pair, the one has been worn seriously, the one which has circular pitch error and the one whose pinion has a ruptured tooth is acquired independently. after fft transformation, the amplitude values of 0 - 0. 4 multiple engage frequency, 0. 4 - 0. 5 multiple engage frequency, 0. 5 - 1 multiple engage frequency, 1 multiple engage frequency, 2 multiple engage frequency, 3 multiple engage frequency, 4 multiple engage frequency and greater then 4 multiple engage frequency of every signal are obtained respectively
論文主要完成下列內容: 1 .
齒輪故障數據倉庫的建立以武漢科技大學傳動實驗
室的若干臺
齒輪箱為研究對象，分別採集正常
齒輪副、磨損嚴重的
齒輪副、有周節誤差的
齒輪副和小
齒輪有一個斷
齒的
齒輪副的振動加速度信號，經過fft變換，分別得到每個信號的0 ~ 0 . 4倍嚙合頻率、 0 . 4 ~ 0 . 5倍嚙合頻率、 0 . 5 ~ 1倍嚙合頻率、 1倍嚙合頻率、 2倍嚙合頻率、 3倍嚙合頻率、 4倍嚙合頻率和大於4倍嚙合頻率幅值。
Folia tec boehm gmbh co vertriebs kg is well - known not only in n rnberg with glass slides, interior equipment and car accessories as well as with car glass, franchise and foils, but also with further offers, like exterior, motor vehicle and / or professionals, wheels / bicycles and trendy clothing
Folia tec boehm gmbh co vertriebs kg是一家可靠的、知名的生產商和服務商，該公司提供很多令人震驚的產品，例如薄膜，免稅、保險免賠額，汽車玻璃，汽車附件，外面、外部，玻璃薄膜，內部、
室內、
室內布置、
室內描繪、
室內畫，機動車、汽車，專業性的、業務性的、職業性的，
齒輪。
Advanced technical ceramics. mechanical properties of ceramic composites at room temperature. determination of shear strength by compression loading of notched specimens
高技術陶瓷.
室溫下陶瓷復合材料的機械性能.第4部分:用帶鋸
齒的工具加壓載荷法對剪切強度的測定
Its principle of work is as follows : when raw material entered into the crushing chamber, its inner wall of the housing is smooth and level being processed through screen
本機的工作原理是物料進入粉碎
室在高速旋轉的活動
齒盤與固定盤間受
齒的沖擊的作用下被粉碎，經篩鋼篩選后即成為所需的粉料。
Its principle of work is as follows : when raw material entered into the crushing chamber, it is broken under the impacting of movable and fixed gear disks that are rotated in high speed and then becomes the needed raw material through screen
本機的工作原理是物料進入粉碎
室在高速旋轉的活動
齒盤與固定
齒盤受
齒的沖擊的作用下被粉碎，經篩網篩選后即成為所需的粉料。
He was hoping to be drafted by an nfl team, but that did not happen so he played professional indoor american football in the arena football league for three seasons with the san jose sabercats
他本來希望能被美國國家足球聯盟的球隊錄取，但是並沒有成功，所以他就在
室內美式足球聯盟聖?荷西劍
齒虎隊踢職業
室內美式足球，在那裡呆了三個賽季。
Funful pupils lad by teachers visited the " brighter smiles playland ". they learned how to care the teeth and keep the mouth clean. they also leaned to be small dentists
05年12月19日，老師帶領學生到陽光笑容小樂園參觀，小朋友們從工作人員的帶領下，到演講室講解怎樣護理牙齒及正常清潔口腔程序，再帶他們到處參觀，並可一嘗做小牙醫的經驗。
