1. The physical properties of rubber accelerator 2-mercapto benzothiazole and main methods for its preparation are introduced.
   介绍橡胶硫化促进剂2-巯基苯并噻唑的物理性质和主要的制备方法。
2. Aerogel is a kind of low density porotic material which has many special physical and chemical properties.
   气凝胶是一类具有许多独特物理、化学性质的轻质多孔材料，在众多的领域中具有应用或潜在的应用价值。
3. The composition was determined and its physical and chemical properties,processability,curing reaction exothermicity and heat resistance were examined.
   实验确定了灌封胶的配比,并考核了胶的理化性能、工艺性能、热反应性能、耐高温性能等。
4. Thestabilized powders have obvious better oxidation resistance than unstabilized Pow-ders.And the other physical and chemical properties remain constant.
   经钝化处理后的粉末，其抗氧化性显著提高，而其他物理性能及化学组成基本保持不变。
5. A comparison was made among the cure characteristics and physical properties of three different substituted thiuram accelerators in NR.
   对3种不同取代基的秋兰姆类促进剂在天然橡胶中的硫化特性及物理性能进行了比较。
6. A new typal insecticide, its generation, physical and chemical properties, insecticidal mechanism, insecticidal characteristic and synthesis of diflubenzuron are introduced.
   介绍了新型杀虫剂──除虫脲的发现、理化性质、杀虫机理、杀虫特点及合成方法。
7. Scaning electron microscopy and cyclic voltammetry are applied to characterize both the physical and chemical properties of the Ag ring ultramicroelectrode.
   用扫描电子显微镜和循环伏安法对制备的环电极进行了物理和化学性能表征。
8. Scaning electron microscopy and cyclic voltammetry are applied to characterize both the physical and chemical properties of the Au ring ultramicroelectrode.
   用扫描电子显微镜和循环伏安法对制备的电极进行了物理和化学性能表征。
9. The effects of undecomposable organic materials mixed with biopreparate on the physical and chemical properties of continuous cropping greenhouse soil were studied.
   研究了有机物料配合生物菌剂施入塑料大棚连作土壤后,对土壤理化性质的影响。
10. In the compression moulding technology, preheat and prepressing procedures are added to improve the flowability of the bond and physical and mechanical properties of the product.
    在压缩模塑工艺中，增加预热、预压工序，提高粘合剂的流动性和产品的物理机械性能。
11. The causes are presented as follows: packer unloading pressure, formation damage, oil tool plugging, formation voidage, the worst formation physical properties and the effect from vicinage wells.
    地层污染或工具堵塞;地层欠压;地层物性极差;邻井影响等。

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