The major factors to make machine tools vibration are external excitation and self-excitation.

工具機(jī)所引起振動(dòng)主要因素為外力激振與自激激振国产三级电影视频。

Results The relationship between teachers and students, contradiction between theory and practice, students' self-preparation, and clinical setting were regarded as main reasons leading to stress.

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A numerical calculation for the conversion rate of calcium superphosphate products was derived by the a-nalysis of factors on the conversion rate,and a method for the determination of ratio of phosphate ore incomplete decomposi-tion and available phesphate degeneration induced by sesquioxide was put forward,which provided a path for the predictionand adjustment of the process system.

對(duì)影響普鈣產(chǎn)品轉(zhuǎn)化率的各種因素進(jìn)行了分析，利用MATLAB 軟件包得到了轉(zhuǎn)化率的計(jì)算公式国产无套推油按摩女视频推油，提出了確定未分解磷礦的比例和由倍半氧化物引起的有效磷退化幅度的方法国产日韩欧美妖亚欧在线，為生產(chǎn)系統(tǒng)的預(yù)測(cè)和調(diào)整提供了一種途徑国产二区视频在线观看。

In one of his earlier works that aroused interest in his peers, Shepherdess of Northern Sala, one could see many factors that coincide with the spirit of German expressionism.

在其早期所創(chuàng)作并引起業(yè)界關(guān)注的油畫作品《北薩拉的牧羊女》中，就可以看到有諸多因素暗合德國(guó)表現(xiàn)主義繪畫精神日本sy一级黄色片。

The early Palaeozoic black shales widely distributed in southern China, which were majorly formed in followimg periods: Hetang period of Early Cambrian, Miaopu period of Middle Ordovision, Wufeng period of Late Ordonision and Longmaxi period of Silurian.

本文通過對(duì)四期缺氧期間黑色頁(yè)巖的分布免费无码一级黄色视频、沉積特征及古構(gòu)造、古地理背景的研究国产人爱视频A片在线观看，指出華南缺氧事件和黑色頁(yè)巖的形成可以由地內(nèi)或地外的多種因素引起欧美精品视频专区在线。

It has been found that there are some texture flaws such as large grain、badly distorted twin and streaky structure. But recrystallization grains ofaround 19μm in diameter on average are obtainable through heat treatment at300℃for 30min by air-cooling, meanwhile the twin and streaky structurethat would weaken the plasticity of alloy are eliminated; significant elementsare holding temperature鲁一鲁在线观看精品视频、holding time在线黄色视频了,、cool-down methods. Mechanicalproperties of tube are obtained, simple tension elongation ratio of arc testsample increases from 10.8% to 20.1%, elongation ratio with elastic internaldie of tube increases from 8.0% to 14.9%.

研究結(jié)果表明：擠壓成型的AZ31鎂合金管材組織中存在變形程度很大的孿晶、大尺寸晶粒无码又黄又湿又免费视频下载、喪失了進(jìn)一步變形能力的條帶狀組織等易導(dǎo)致后續(xù)塑性加工時(shí)變形不均免費看男女高潮又猛又爽，引起斷裂的組織缺陷；采用最佳等溫?zé)崽幚砉に囈?0℃／min加熱至300℃保溫30min后空冷處理可以使試樣平均晶粒直徑從擠壓態(tài)的50μm細(xì)化為19μm99精品热视频只有精品16，同時(shí)基本消除上述組織缺陷成年人一级黄色视频；明顯影響熱處理效果的因素為保溫溫度、保溫時(shí)間在线免费看黄有限公司、冷卻方式欧美A片在线中文字幕；室溫下，采用最佳工藝熱處理前后管材弧形試樣的單向拉伸伸長(zhǎng)率由10.8％提高至20.1％久久精品房事视频，管件的自由脹形極限伸長(zhǎng)率由8.0％提高至14.9％一级毛片黄久久久免费看。

Skipping is cheap, it's simple, and finally, it's very trendy.

這是由三個(gè)因素引起的，跳躍是廉價(jià)的一级看片免费视频精品，簡(jiǎn)單的国产精品日韩，最后一個(gè)原因是，它是非常時(shí)髦的的国产最新综合久久。

But when the fabric was made into slipcover, such surrounding factors as dampness will cause the shrink, extension, looseness, and unevenness of the fiber, which is determined by its structure and the component.

而當(dāng)紡織品被制成沙發(fā)套飾時(shí)黄色视频观看免费的黄色网站，濕度等環(huán)境因素還是會(huì)引起纖維一定程度的收縮、增長(zhǎng),国产免费、松散和不均勻欧美激情亚洲熟妇，這是由織物的結(jié)構(gòu)和纖維的成分決定的。

Snap bean contains an important component-saponins, which appear to be one of the factors causing foods poisoning. So the determination of the content of the total saponins in snap bean is significant to food safety.

豆角中含有一種重要成分―皂苷欧美一亚洲一日韩一综，它是引起食物中毒的重要因素之一葡京99热这里只有精品_，因此研究皂苷的含量對(duì)于食品安全具有一定的意義。

Chapter six, in consideration that the worm tongue structure is a key factor affecting noise generation, the mathematical model of centrifugal fan noise increment that is produced by worm tongue structure is established by using of the D—optimizng technology and dimension analysis method, and the spectral property of fan noise produced by worm tongue structure is analysed.

第六章国产刺激欧洲，針對(duì)離心風(fēng)機(jī)蝸舌是影響離心風(fēng)機(jī)噪聲的關(guān)鍵因素的特點(diǎn)，采用D—最優(yōu)化技術(shù)并結(jié)合量綱分析法色哟哟网站一区二区，建立了離心風(fēng)機(jī)蝸舌引起的噪聲增量與蝸舌結(jié)構(gòu)參數(shù)的數(shù)學(xué)模型给黄片去水印会被查吗，并分析了蝸舌結(jié)構(gòu)參數(shù)及其對(duì)葉輪聲輻射頻譜特性的影響九九精品国产。