One way of identifying a substance without resorting to fiddly chemical methods is to determine its density.
其中一种不用高精度的化学方法验证物质的办法就是确定它的密度。
One way to identify a substance without resorting to fiddly chemical methods is to determine its density.
要分辨一种物质，可以用密度测量法。而无须借助费事繁琐的化学分析法。
There is no realistic prospect for widespread electric air travel: the jet engines on aircraft need the high-energy density that only chemical fuels can provide.
广泛的以电力为驱动的空中旅行很不现实：飞机发动机需要高密度的能量，而这些只有化学燃料才可提供。
The spectral modulation sensor system can detect and measure various physical parameters such as pressure, temperature, gas density, and various chemical species.
这种光谱调制传感器系统能够测量多种物理参数，如压强、温度、气体密度及多种化学成份。
LDPE (Low Density Polyethylene) : Offers such advantage as tear strength and high chemical resistance. It is also waterproof.
(低密度聚乙烯)：具有以下优良性质：高撕裂强度，高耐化学性，防水性。
Methods:adhesive killing method for density investigation, and cockroach gel bail for chemical control.
方法：密度调查采用粘捕法，化学防治采用高效灭蟑毒饵；
Methods Adhesiving killing method for density investigation, and Premise cockroach gel bait for chemical control.
方法密度调查采用粘捕法，化学防治采用拜灭士杀蟑胶饵。
The applications are included in the pressure, temperature, gas density, and chemical species sensors.
这些应用包括压强、温度、气体密度和化学物质传感器等。
Carbon materials, including graphite, carbon fibre, carbon foam and expanded graphite possess the properties of high conductivity, low density and good chemical stability.
碳材料如石墨、碳纤维、碳泡沫和膨胀石墨，他们都具有高导热系数、低密度和良好的化学稳定性。
In exploration period of hydrocarbon reservoir, oil density, viscosity and saturation can be determined using geo-chemical pyrolysis data.
油藏勘探阶段，利用录井地化热解资料可以准确地求取原油粘度和含油饱和度。
At present, means to control locusts harm is chemical medicament which can reduce insect density.
我国目前控制蝗虫危害的手段主要是采用化学药剂来降低虫口密度。
In the present paper, the relation between diamond nucleation density and synthesis conditions is studied for the diamond thin film synthesized by hot filament chemical vapour deposition method.
本文研究了用热灯丝化学气相沉积方法在单晶硅衬底上制备金刚石薄膜时其成核密度与制备条件的关系。
A chemical additive or inert material used to decrease the density or increase the yield of a cement slurry.
减小水泥浆密度或增加水泥浆产率所用的化学添加剂或惰性材料。
Objective:To determine viscosity and density of Konjac Glucomannan which is major chemical ingredient of Amorphophallus konjac and provide experimental data for pharmaceutical use.
目的：测定魔芋主要化学成分葡甘露聚糖的粘度及密度，为其在制剂中的应用提供依据。
Both yields of ground wood timber and chemical pulp timber increase with increase of site index and planting density.
磨木浆材和化学浆材产量随立地指数和密度的增大而增加。
Planting density has significant effects on fiber morphology, physical and chemical properties of Lalix olgensis wood. Except growth-ring width, remarkable differences was found in other indexes.
初植密度对落叶松人工林的纤维形态特征、物理特征及化学特征有重要的影响，除生长轮宽度外，其它各指标差异显著；
The fish chemical composition and energy density in the 10 samples were measured.
测定了这10个样本的化学组成和能量密度。
Methods 1%yekang cockroach gel bait and 0.5% Permanone smoke fog were used for chemical control. Adhesive killing method was applied in density investigation.
方法采用1%晔康杀蟑胶饵和0.5%氯菊酯的烟雾剂，密度监测采用粘捕法。
They are outstanding for their hardness, density and resistance to thermal shock, wear, chemical attack and self-lubricating property.
它具有硬度高、密度高、抗热振性、耐磨性抗化学腐蚀性和自润滑性好等特点。
The application status of PVC resin with high apparent density and moderate oil-absorption rate in chemical building materials industry was introduced.
阐述了高表观密度和适中吸油率PV C树脂在化学建材业的使用效果。
Secondly, the particle density, energy density, net baryon density and net strangeness density are calculated, and the relation between them and chemical potential is discussed.
其次计算粒密度、能密度，净重子密度和净奇异子密度以及分析它们和化学势的关系。
Chemical fog: Overall density produced by an excessive degree of development, due to unexposed silver halides being attacked by the developing solution.
化学灰雾：显影过度造成全面性增加的密度。是由于未曝光的卤化银被显影液感染所引致。
A new low temperature and deepwater slurry system prepared with chemical foaming gas and solid packings, which can reduce the density of the slurry, is introduced.
介绍了一种新型的化学发泡气体充填与固体充填减轻制备的低密度低温深水水泥浆体系，并对其在海洋深水环境下的性能进行了系统的室内评价研究。
Method: Density investigation: stick catch; Chemical methods: applying high effect cockroach bait.
方法：密度调查采用粘捕法，化学防制采用高效灭蟑毒饵。
Optical filters in the space telescope allowed astronomers to precisely determine the nebula's chemical makeup, temperature, and density, and to trace the stages of the star's demise.
天文学家借助哈勃太空望远镜的光学过滤器，可以准确查明该星云的化学组成、温度和密度，并追踪恒星的死亡过程。
The foamed ceramic material with high open porosity is characterized by low apparent density , high permeability, and resistance to high temperature and chemical corrosion.
泡沫陶瓷具有密度小、透气性高、耐高温、抗化学腐蚀等特性。
LDPE (Low Density Polyethylene) : Offers such advantage as tear strength and high chemical resistance. It is also waterproof.
LDPE(低密度聚乙烯)：具有以下优良性质：高撕裂强度，高耐化学性，防水性。
In the study, in order to get good precision of dimension and position of fine leads, chemical etching method is used to make high density double assess single-sided FPC.
研究采用化学蚀刻聚酰亚胺的方法来制作双面连接的单面挠性板，以满足精细手指的尺寸和位置精度的要求。
The composite power supply combined the capacitor with chemical battery, so it has high power density.
利用电容器这一特性，把它和化学电池结合起来，组成了具有较高比功率的复合电源。
The composite power supply combined the capacitor with chemical battery, so it has high power density.
利用电容器这一特性，把它和化学电池结合起来，组成了具有较高比功率的复合电源。
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