引起因素

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

工具机所引起振动主要因素为外力激振与自激激振。

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.

结果 师生关系、理论与实践的矛盾、学生自我准备、临床环境、科室氛围被护生认为是引起临床压力的重要因素。

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.

对影响普钙产品转化率的各种因素进行了分析，利用MATLAB 软件包得到了转化率的计算公式，提出了确定未分解磷矿的比例和由倍半氧化物引起的有效磷退化幅度的方法，为生产系统的预测和调整提供了一种途径。

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.

在其早期所创作并引起业界关注的油画作品《北萨拉的牧羊女》中，就可以看到有诸多因素暗合德国表现主义绘画精神。

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.

本文通过对四期缺氧期间黑色页岩的分布、沉积特征及古构造、古地理背景的研究，指出华南缺氧事件和黑色页岩的形成可以由地内或地外的多种因素引起。

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、holding time、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%.

研究结果表明：挤压成型的AZ31镁合金管材组织中存在变形程度很大的孪晶、大尺寸晶粒、丧失了进一步变形能力的条带状组织等易导致后续塑性加工时变形不均，引起断裂的组织缺陷；采用最佳等温热处理工艺以20℃／min加热至300℃保温30min后空冷处理可以使试样平均晶粒直径从挤压态的50μm细化为19μm，同时基本消除上述组织缺陷；明显影响热处理效果的因素为保温温度、保温时间、冷却方式；室温下，采用最佳工艺热处理前后管材弧形试样的单向拉伸伸长率由10.8％提高至20.1％，管件的自由胀形极限伸长率由8.0％提高至14.9％。

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

这是由三个因素引起的，跳跃是廉价的，简单的，最后一个原因是，它是非常时髦的的。

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.

而当纺织品被制成沙发套饰时，湿度等环境因素还是会引起纤维一定程度的收缩、增长、松散和不均匀，这是由织物的结构和纤维的成分决定的。

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.

豆角中含有一种重要成分―皂苷，它是引起食物中毒的重要因素之一，因此研究皂苷的含量对于食品安全具有一定的意义。

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，针对离心风机蜗舌是影响离心风机噪声的关键因素的特点，采用D—最优化技术并结合量纲分析法，建立了离心风机蜗舌引起的噪声增量与蜗舌结构参数的数学模型，并分析了蜗舌结构参数及其对叶轮声辐射频谱特性的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。