查询词典 sampling fraction

"Rare in nature, olefins are obtained by the cracking of petroleum fraction s at high temperatures. The simplest ones (ethylene, propylene, butylene, butadiene, and isoprene) are the basis of the petrochemicals industry."

烯烃在自然界很稀少，但在石油裂解成汽油过程中可大量生成，低级的单烯烃已成为庞大的石油化学工业的基础。

Separation of the sub-quality part of the ore and the barren rock is exercised by the fractionated screening of each size of the ore by application of the lump size X-ray spectral separation and the small-portion X-ray spectral classification with the following purifying operations of the tail products of the main processes for each of the fraction, which are similar to the main processes.

在应用大规模的X射线光谱分离和小部分X射线光谱分类分级筛选不同大小的矿石的基础上，对次级矿石和贫矿石进行净化处理。然后，对各部分主要过程的尾矿进行净化处理，各个小部分的处理方式都类似于主要部分的处理方式。

The calorific value of fuel is primarily determined by the mass fraction of elements such as carbon, hydrogen and oxygen.

燃料的热值主要取决于燃料中C、H、O等元素的质量分数。

A small fraction of the carbonic acid remains in solution without dissociating, as does a little carbon dioxide.

一小部份的碳酸和少量二氧化碳则不会解离，保持原状，留在溶液里。

Before and after treatment, the left ventricular ejection fraction was measured by ultrasonic cardiography.

治疗前后分别行动态心电图检查，测量左室射血分数，测定血清钾浓度。

Comparison of changes in ejection fraction to changes in impedance cardiography cardiac index and systolic time ratio.

无创血流动力学监测对老年隐性心衰的临床意义。实用老年医学， 2008， 22(2)： 159160。[3] 马立业。无创心脏血流动力学监测仪的工作原理、参数意义和临床价值。

Because the limonene does not have a carbonyl group, the small amount of it which remainsin the carvone fraction will not form a semicarbazone derivative.

由於柠檬烯没有羧基，留在香芹酮馏份中少量的柠檬烯将不会产生缩胺基脲的衍生物。

This paper presents a method of synthesizi ng non-equiripple low-pass filter based on iteration analysis,in which the rat ional fraction formed of Chebyshev polynomial is used as the filter characterist ic function.

提出一种用切比雪夫多项式构成有理分式作为滤波器的特征函数，并利用迭代分析进行非等波纹低通滤波器综合的方法。

Chirata, and they were identified as β-sitosterol and swerchirin by spectral method. These two compounds were got firstly from the petrolelum ether fraction of S. chirata.

结论］2种化合物β-谷甾醇与1，8-二羟基-3，5二甲氧基山酮均为首次从印度獐芽菜乙醇提取物的石油醚部位分离得到。

In other words, silicon powder and chloromethane are converted into a mixture of methyl chlorosilane in the presence of catalyst under pressure and heat, and then the intended fraction is separated by efficient fractionation.

产品主要以有机硅单体为原料，采用不同的聚合手段和工艺，添加各种填料和助剂制得。

What was it that made you want to change sider ?

是什么使你临阵倒戈？

I don't know what he wants, but let's play along with him.

我不知道他要干什么，可我