The investigation, he wrote, had been challenging because there were very few research labs able to test for the chemical later identified as the cause of the smell.
他在信中写道，检查遇到了困难，原因是，对于经调查确认造成这种气味的化学物，几乎没有实验室能够测试得出来。
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。
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。
Investigation about three kinds of nickel electrodes modified by cobalt was operated including physical mixture , chemical deposition and covering cobalt .
研究了用物理掺杂、化学镀、包覆等三种方式饰钴后的镍电极的性能。
Based on the investigation of comprehensive literatures about asphaltene deposition, the physical and chemical deposition mechanism of asphaltene and its plug to pore and throat are summarized.
在充分调研国内外沥青质沉积资料的基础上，对沥青质的物理化学沉积机理、沥青质堵塞储层孔喉的机理进行了总结。
On the formation of iron oxide scale with the danger of condenser factory iron oxide scale of the investigation, determined the chemical cleaning solution.
介绍了氧化铁垢的生成与危害，通过对某厂冷凝器氧化铁垢情况调查，确定了化学清洗的方案。
Through field investigation and chemical analysis, the reasons why soil ecological environment deteriorated on facility farmland were studied.
采用调查研究与化学分析相结合的方法，对设施农田土壤生态环境恶化的原因进行了初步研究。
By combination of field investigation, indoor man-feeding and the result of chemical analysis, the authors studied the influence of nicotine on peach aphids.
采用田间调查和室内饲养的方法，结合化验分析结果，分析了烟草次生物质烟碱对烟蚜的影响。
A detailed investigation and engineering analysis of environmental pollution accidents in a chemical plant have been made to select the main risk factors and to evaluate their risks.
对某化工厂事故隐患进行了周密调查及工程分析，筛选出主要风险因子并进行风险预测；
Based on the field investigation and soil analysis, some soil physical and chemical properties in different agroforesty systems in northern area of Jiangsu province were studied.
采用野外调查与室内分析测定的方法，研究了苏北地区林粮间作地土壤理化性质。
Complex, vast, and multidisciplinary, chemical propulsion has been the subject of extensive investigation over the past few decades.
复杂，巨大，和多学科，化学的推进力是在过去的几十年广泛的调查的主题。
According to the investigation of Puerariae radix, the chemical constituents mainly include isoflavonoids, triterpenoidal and aromatic compounds;
根据对中草药葛根的调查研究：它的化学成分主要为异黄酮类、三萜类和芳香类化合物；
The chemical investigation resulted in the isolation of 63 compounds, and the structures were determined based on the modern spectral technology.
采用现代技术分离黄瑞香、陕甘瑞香和结香中的化学成分，鉴定了63个（次） 单体化合物的结构。
Test investigation on the chemical shrinkage or expansion of alkali-activated cementing materials and water-cement were carried out in this paper, in which water-cement was as control sample.
本文对碱激胶凝材料与水-水泥体系的化学收缩或膨胀进行了试验研究，其中以水-水泥体系为对比样。
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。
In chemical and petrochemical industries, it is of scientific research and practical value to develop experimental investigation into explosion of premixed gases in spherical shape vessel added pipes.
开展加管道球形容器内预混气体爆炸实验研究在化工和石化企业中具有重要的科研和实用价值。
We are also interested in the kinetic investigation of a chemical reaction in liquid phase .
我们也有兴趣于在液相中化学反应之动力学研究。
The investigation of scheduling of batch chemical processes and the on-line modification are presented in this paper.
间歇化工过程调度是一类十分复杂的组合优化问题。
This paper briefly introduces the investigation on chemical enterprises of Shanxi Province and, based on this, puts forward some measures for educational reform of chemical speciality.
文章简述了山西化工企业调查情况，并在此基础上提出了化工专业进行教学改革的措施。
The methods for experimental investigation, such as chemical equilibrium and EMF methods, are discussed in detail in conjuction with critical comments on typical research work.
结合有代表性的研究工作评价了该研究领域中典型的研究测试方法，其中重点评价了化学平衡法和原电池电动势法用于此类研究的利弊。
Based on investigation of hydrologic characteristics in the Qaidam Basin, main concern of this paper is devoted to water chemical analysis.
文章在对柴达木盆地水文特征研究的基础上，重点对柴达木盆地主要河流的水化学特征进行了较为全面的分析研究。
So far the modifying methods mechanism is not understood deeply. Further investigation shall be made from aspects of chemical and physics.
指出目前在各种调质方法机理的认识上还远不够深入，应从物理化学的角度来对机理进行进一步的探讨。
The investigation has proved that the ratio of the ferrite to austenite being approximate to 1 in the steel is possible by controlling its chemical composition and heat treatment condition.
研究证实，双相不锈钢通过成分和热处理的控制，使得铁素体和奥氏体两相比约为1是可能的，同时它具有优良的耐点腐蚀性能、耐应力腐蚀性能和耐冲刷腐蚀能力；
This paper summarized the pharmacological and toxicological effects of the plant and its related chemical constituents, which provides some references for further investigation.
现就国内外有关补骨脂及其相关化学成分的药理和毒理研究成果进行综述，为全面开发利用补骨脂提供依据。
Chemical carcinogenesis in culture has proved to be a much more difficult field of investigation than viral carcinogenesis.
在培养内化学致癌已证明是一个比致癌困难得多的研究领域。
Section 2: the investigation and analysis of the status in quo of the chemical project study in Gansu province.
第二部分：甘肃省开展化学研究性学习现状调查和分析。
Section 2: the investigation and analysis of the status in quo of the chemical project study in Gansu province.
第二部分：甘肃省开展化学研究性学习现状调查和分析。
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